All RFID Product
Passive RFID works by using radio-frequency energy from a reader to activate an unpowered RFID tag. The tag’s antenna captures the RF energy, powers its chip, and returns stored identification data through backscatter. The reader receives that response, decodes it, and sends the tag information to software.
The key word is passive.
A passive RFID tag has no battery powering its normal communication operation. Instead, the RFID reader creates an electromagnetic field, and the tag harvests enough energy from that field to activate its integrated circuit.
For UHF RFID, GS1 describes RAIN RFID as a passive-backscatter technology in which the reader supplies energy and communicates with the tag, while the tag responds by changing the reflection of the RF signal.
The basic interaction is:
Reader → RF energy → Tag antenna → Tag chip → Backscatter response → Reader → Software
There is no optical scanning step.
No printed code needs to be visible.
No battery is required in the passive tag.
That simplicity is deceptive. Once hundreds of tags enter the same RF field, antenna orientation, interference, material composition and protocol timing start to matter considerably.
A passive RFID tag is small, but its construction is quite deliberate.
A typical tag contains:
The tag’s antenna is particularly important.
A beautifully designed RFID chip cannot compensate for an antenna that performs poorly on the intended product.
A tag designed for cardboard may behave very differently when attached to a steel tool, liquid container or machinery component.
GS1 notes that specialized RFID tags can be designed for challenging environments such as metal and water, where ordinary tag designs may lose performance.
That is something I check early when evaluating a passive RFID project: what is the tag physically attached to?
Not what it looks like in the catalog.
The reader transmits RF energy through its antenna.
When a passive tag enters a sufficiently strong RF field, energy is coupled into the tag antenna. The tag’s circuit rectifies that RF energy and uses it to power the RFID chip.
The available energy depends on several variables:
| Factor | Effect on passive RFID |
|---|---|
| Reader output power | Determines available RF energy |
| Reader-to-tag distance | Greater distance generally reduces available energy |
| Antenna gain | Changes field distribution |
| Tag antenna design | Determines coupling efficiency |
| Tag orientation | Can strongly affect received energy |
| Operating frequency | Influences antenna and material behavior |
| Product material | Can absorb, reflect or detune RF energy |
| RF interference | Can reduce usable communication margin |
GS1 explains that passive RAIN RFID tags obtain energy from the reader’s RF signal rather than using an internal battery.
This is why passive RFID can remain inexpensive enough for large-scale item identification.
The tag does not need to carry a power source for ordinary operation.
Once the tag has enough energy, the reader initiates communication.
The tag does not behave like a miniature Wi-Fi transmitter.
Instead, passive UHF RFID uses backscatter.
The tag changes the electrical characteristics of its antenna load. That changes how the incoming RF signal is reflected. The reader detects these variations and reconstructs the information encoded in the response.
GS1’s EPC UHF Gen2 specification defines this reader-to-tag communication and passive backscatter mechanism.
A useful mental picture is a mirror.
The tag is not shining its own flashlight back toward the reader. It is changing how it reflects the reader’s existing signal.
That weak reflected signal is what the reader has to recover.
And that is one reason receiver design matters so much.
Passive RFID becomes particularly useful when many tagged objects are present at the same time.
Imagine a pallet containing dozens of cartons.
A reader does not simply ask every tag to speak simultaneously.
EPC Gen2 provides inventory and anti-collision procedures that allow the reader to manage a population of tags and identify individual responses. GS1 describes the technology as supporting multi-tag inventory operations through reader-controlled communication.
A simplified sequence is:
This is where laboratory demonstrations can become misleading.
Reading one tag from a clean table is easy.
Reading a dense pallet where tags face different directions is the real engineering test.
There is no universal passive RFID read distance.
GS1 states that typical passive UHF RFID tags can be read over several meters, with up to 15 meters possible in special cases. GS1 also notes that specialized high-sensitivity systems can achieve greater ranges.
The actual distance depends on:
For that reason, “15 meters” should never be interpreted as a guaranteed operating distance.
In a warehouse portal, a shorter and tightly controlled read zone can be more useful than maximum range.
I have seen installations where the biggest problem was not missing tags.
It was reading tags that should never have been detected.
Passive RFID exists across several frequency ranges, but UHF is especially important for long-range identification and high-volume inventory applications.
For EPC Gen2 UHF RFID, GS1 specifies operation across the 860–960 MHz range, with regional implementation depending on applicable spectrum regulations.
Other passive RFID systems use different frequency ranges and protocols, which changes antenna behavior, coupling characteristics and typical applications.
For Cykeo’s UHF RFID platforms, relevant protocols can include:
The important distinction is not simply “which frequency is better.”
The question is whether the selected frequency, tag, reader and antenna are appropriate for the physical environment.
The most common mistake is treating the tag and reader as independent products.
They are not.
The antenna on the tag and antenna on the reader form part of the same RF system.
GS1 identifies antenna gain, directivity, polarization and tag orientation as important factors affecting passive UHF RFID read performance.
The surrounding material matters too.
Metal can reflect RF energy and interfere with conventional tag antenna behavior. Specialized on-metal RFID tags use different antenna structures to maintain performance.
Water-rich materials can absorb UHF energy and reduce the available communication margin.
A tag facing the reader can behave differently from one rotated 90 degrees or partially shielded by another object.
A tightly packed group of tags produces a much more demanding inventory environment than a single isolated tag.
Changing the antenna position by a relatively small physical distance can alter the effective read zone significantly.
Cykeo’s RFID development work covers the reader side of this interaction, including RF front-end design, digital signal processing, anti-collision algorithms and multi-tag recognition.
For applicable UHF RFID platforms, Cykeo technology supports features such as:
The CYKEO-M4L combines the RF front end and baseband digital processing in a compact OEM-oriented module. Under specified test conditions, its multi-tag recognition capability exceeds 400 tags/s.
That number is useful, but it is not the whole story.
A reader capable of processing hundreds of tags per second still needs the right tag, antenna, RF environment and software configuration.
The specification becomes meaningful only after it survives the warehouse.
Yes. Suitable passive RFID tags can support both reading and writing, although the available memory and supported commands depend on the tag IC.
In a typical UHF deployment, the EPC identifies the physical item, while additional tag memory can hold application-specific information. GS1 notes that some RAIN RFID tags allow User Memory to be written or changed after deployment, with appropriate access controls available on supported tags.
That distinction matters in industrial projects.
A tag used only for identification may need little more than a serialized EPC. A maintenance application might require additional information to be stored on the tag.
For many projects, however, I prefer keeping the tag data compact:
RFID tag = identity
Business database = detailed information
It reduces the amount of data exchanged over the air and keeps the physical tag independent of the customer’s software architecture.
The fundamental difference is the source of operating power and the way the tag communicates.
| Characteristic | Passive RFID | Active RFID |
|---|---|---|
| Internal battery | Normally no | Yes |
| Tag transmitter | No conventional transmitter | Yes |
| Communication | Backscatter | Active radio transmission |
| Typical tag size | Small | Usually larger |
| Tag cost | Lower | Higher |
| Typical read range | Several meters for UHF | Can reach much farther |
| High-volume item tagging | Well suited | Usually less economical |
| Typical use | Inventory, logistics, asset identification | Long-range asset tracking |
GS1 explains that passive tags draw energy from the reader’s electromagnetic field and communicate by backscatter, while active tags have their own power source and radio transmitter.
There is also a middle category: battery-assisted passive (BAP) tags. They can use a battery to power internal circuitry or sensors while still communicating through backscatter.
The choice should follow the physical problem.
If thousands of low-cost cartons need identification, passive RFID makes considerably more sense than attaching a battery-powered radio to every carton.
For passive UHF RFID, GS1 reports a typical read range of several meters, with up to 15 meters in very special cases. It also notes that highly sensitive phased-array systems can reach around 20 meters.
Those figures are useful reference points, but they should not become the design target by themselves.
The more important question is the shape of the readable volume.
GS1 specifically points to reader antenna directivity and gain, RF polarization and tag orientation as factors that determine that volume.
For example:
A reader that can technically detect a tag from 15 meters away is not automatically the right reader for every one of these situations.
Metal is one of the first environmental factors I investigate during tag selection.
GS1 explains that metallic objects reflect and diffract electromagnetic waves, which can make conventional RFID tags ineffective. Specialized on-metal tags use antenna and packaging designs intended for attachment to metal surfaces.
This matters for:
A common mistake is to test a standard paper-label RFID tag on cardboard, achieve excellent performance, then assume the same tag will work on a steel tool.
It may not.
The tag antenna is part of the RF system. Once the mounting surface changes, the electrical environment around that antenna changes as well.
Water creates a different problem.
GS1 states that liquids can absorb electromagnetic energy and can also detune RFID tag antennas, reducing tag sensitivity and available power.
This is relevant to:
The solution is not necessarily to increase reader power.
A tag designed specifically for the product can be much more effective than simply increasing RF output.
In field testing, I normally compare the same tag on an empty carton, the actual product and the final packaged product.
Those three conditions can produce surprisingly different results.
Speed is one of passive UHF RFID’s strongest practical advantages.
GS1 reports that a handheld RAIN RFID reader can count hundreds of assets in the same time it takes for a single barcode scan, and cites an approximately 95% reduction in average inventory time for RAIN RFID compared with traditional manual barcode inventory processes.
That does not mean every RFID installation will achieve a 95% improvement.
The result depends on the workflow.
If an employee must still pick up every product, rotate it, find the label and manually confirm the result, much of RFID’s potential advantage has already been lost.
The strongest deployments redesign the physical process around automatic identification.
The reader sits where the object naturally passes.
No extra scan gesture.
No barcode alignment.
No opening every carton simply to expose a label.
Passive RFID is particularly effective when many objects need to be identified repeatedly.
Tags can be read as cartons and pallets move through receiving, storage and shipping areas.
Handheld RFID readers can capture multiple tagged products during stock counting without requiring direct barcode alignment.
Tags can identify work-in-process items, components, tooling and production containers.
Passive RFID can record tool issue, return and inventory events.
Large quantities of textiles can be identified rapidly as they move through collection and processing.
Equipment can be associated with specific zones, storage areas or operational events.
Tagged tools and components can be connected to maintenance workflows and service histories.
GS1 describes RAIN RFID as particularly useful for inventory, asset identification and process visibility, while noting that the appropriate technology still depends on the actual business requirement. <h2>How Should a Passive RFID System Be Tested?</h2>
Do not test only the best-case tag.
Test the ugly cases.
A practical validation matrix should include:
| Test | Purpose |
|---|---|
| Single tag | Verify basic communication |
| 10–20 tags | Check early multi-tag behavior |
| Dense tag population | Evaluate collision handling |
| Different orientations | Measure orientation sensitivity |
| Metal-mounted tag | Validate on-metal performance |
| Liquid-containing product | Check material influence |
| Moving items | Validate dynamic reading |
| Maximum expected distance | Establish operating margin |
| Adjacent reader active | Evaluate interference |
| Repeated inventory cycles | Check consistency |
ISO/IEC 18047-63 defines conformance test methods for RFID devices operating under ISO/IEC 18000-63, while ISO/IEC 18000-63 itself specifies the physical and logical requirements of the UHF Type C passive-backscatter air interface.
For an actual deployment, application-specific testing still matters.
Standards establish the communication framework.
The warehouse decides whether the system works.
Cykeo’s UHF RFID platforms are designed around the reader side of passive RFID communication, combining RF processing, digital signal processing and application interfaces.
Depending on the model, Cykeo solutions can provide:
The CYKEO-M4L is designed for OEM development, integrating the RF front end and baseband digital processing into a compact module. Under specified test conditions, its multi-tag recognition capability exceeds 400 tags/s.
For a fixed industrial installation, however, raw processing speed is only one parameter.
A reader processing 400 tag events per second is not useful if the antenna is covering the wrong area.
For that reason, Cykeo deployment work needs to consider reader configuration, antenna position, tag selection and application logic together.
Passive RFID works by harvesting RF energy from a reader. The tag uses that energy to operate its chip and communicates by modulating the reflection of the reader’s signal through backscatter. The reader receives and decodes the response.
No. Standard passive RFID tags do not require an internal battery for normal operation. They obtain operating energy from the reader’s electromagnetic field.
Passive UHF RFID typically works over several meters. GS1 states that up to 15 meters is possible in very special cases, while specialized high-sensitivity systems can reach around 20 meters.
Yes, but ordinary RFID labels may perform poorly on metal. Dedicated on-metal tags use specialized antenna and packaging designs to improve performance on metallic surfaces.
Yes, but water can reduce performance because it absorbs RF energy and can detune the tag antenna. Dedicated tag designs can reduce this effect.
Yes. UHF passive RFID systems use collision-arbitration mechanisms to identify individual tags within a multiple-tag population. ISO/IEC 18000-63 defines the relevant collision-arbitration and communication procedures for Type C systems.
Some can. Suitable RAIN RFID tags can provide writable User Memory, allowing information to be changed after deployment when the tag and reader support the required commands.
How does passive RFID work? A reader supplies RF energy to an unpowered tag, the tag uses that energy to activate its chip, and the chip communicates by backscatter. The reader captures the response, identifies the tag and transfers the resulting data to the application.
The most important practical point is that passive RFID is not simply a reader-and-label purchase.
It is an RF system.
The tag, reader, antenna, mounting surface, operating environment, protocol and software all influence the final result.
For a cardboard carton, a conventional passive UHF label may be enough.
For a steel tool, an on-metal tag may be required.
For a liquid-filled product, tag placement and antenna construction become much more important.
For a warehouse portal, controlling unwanted reads can matter more than achieving the longest possible distance.
That is the engineering reality behind how does passive RFID work.
SSD-R16L Multi-Channel RFID Infrastructure for Automated Inventory Management ✔️ 16-Port High-Density RFID Reading Equipped with 16 SMA antenna ports, SSD-R16L supports multi-antenna deployment for warehouses, retail stores, logistics, production lines, and large-area RFID identification. ✔️ High-Speed & Long-Range Performance With up to 33…
SSD-R8L 8-port UHF RFID reader with 33dBm output, up to 20m reading range and 600+ tags/s recognition. Ideal for warehouse, logistics, retail and asset tracking.
SSD-R4L is a 4-port UHF RFID fixed reader with 33dBm output power, up to 20m reading range, EPC C1G2 support and 600+ tags/s reading speed.
CYKEO CYKEO-D1LA USB RFID Reader is a compact desktop solution with near-field control for precise tag reading and encoding. Powered by USB, supporting ISO 18000-6C, and built for stable batch writing, this usb rfid tag reader fits retail, libraries, offices, and controlled RFID encoding tasks.
CYKEO CYKEO-D1L RFID scanner USB is a compact desktop UHF RFID scanner designed for short-range tag writing and verification. This usb rfid scanner supports batch encoding, stable 0–26 dBm output, and works across Windows, Linux, and Android systems.
CYKEO CYKEO-D1C USB RFID Card Reader is a near-field UHF desktop writer designed for secure, short-range tag encoding. With USB-C connectivity and stable 26 dBm output, this rfid reader usb c is ideal for badge issuance, label encoding, and controlled desktop RFID workflows.
CYKEO CYKEO-D2L RFID Reader USB is a compact desktop encoder built on the Impinj R500 chip. With near-field control and stable USB power, this usb rfid card reader delivers precise tag writing for offices, retail counters, and small-scale logistics encoding tasks.
CYKEO CYKEO-D3L USB RFID Tag Reader delivers stable UHF tag reading and writing for daily desktop and light industrial tasks. Designed for controlled short-range operation, this USB RFID Tag Reader works reliably with rfid tag and reader systems in libraries, tool tracking, and inventory registration.
The CYKEO CYKEO-D4L UHF RFID Tag Reader is a stable Desktop RFID Reader designed for accurate tag registration, borrowing, and return workflows. Built with the Impinj R2000 chip, this UHF RFID Tag Reader delivers controlled short-range reads for libraries, asset tracking, and inventory management environments.
The CYKEO CYKEO-D5L Desktop RFID Card Reader is a stable UHF RFID Card Reader designed for controlled short-range reading and writing. Built for libraries, tool rooms, and asset desks, this UHF RFID Card Reader supports dense tag handling, secure data processing, and easy USB integration.
The CYKEO CYKEO-D6L RFID Reader Writer is a heavy-duty Desktop RFID Reader designed for short-range, high-accuracy tag programming. Built for libraries, labs, and asset desks, this RFID Reader Writer supports batch processing, stable 33dBm output, and seamless integration with existing management systems.
Cykeo CYKEO-D8B UHF RFID tunnel and RFID Desktop Reader features 30+ items batch reading,
Cykeo CYKEO-D8A embedded RFID badge reader offers 30+ tags/sec scanning, 20cm anti-crosstalk precision, and DC 12V power for unmanned stores, warehouses, and smart inventory systems.
Cykeo’s CYKEO-D8C UHF RFID gate reader achieves 200-tag/batch scanning with adjustable power control, ideal for retail inventory and smart warehouse management.
CYKEO Embedded RFID Modules are designed for compact industrial and IoT devices that require stable UHF performance. These UHF RFID Modules support global protocols, flexible power control, and reliable multi-tag reading for smart cabinets, production lines, and asset tracking systems.
CYKEO Embedded RFID Module is built for compact IoT and industrial devices that need stable UHF performance. This UHF module supports global protocols, low power operation, and reliable multi-tag reading for smart lockers, production lines, and always-on RFID systems.
CYKEO CYKEO-M1 drone rfid module is a compact UHF RFID reader module designed for drones and UAV platforms. It supports long-range aerial scanning, fast multi-tag reading, and stable performance in wind, vibration, and outdoor environments.
CYKEO CYKEO-M4 RC522 RFID Module is an industrial-grade UHF RFID reader with 4 ports, supporting ISO, EPC, and GB protocols. High-speed, accurate reading for IoT, automation, and warehouse applications.
CYKEO CYKEO-M8 Module RFID is an 8-port UHF R2000 RFID Module designed for high-density, multi-tag environments. Stable 33dBm output, ISO & GB protocol support, ideal for warehouses, factories, and automated systems.
CYKEO CYKEO-M16 RFID Module is a 16-port UHF RFID reader module based on the R2000 chipset. Designed for dense tag environments, it supports ISO and GB standards and delivers stable multi-antenna control for industrial automation.
The CYKEO CYKEO-M16L RFID Reader Module is a 16-channel UHF RFID core designed for dense tag environments. With adjustable 33dBm output, multi-protocol support, and stable multi-antenna control, this RFID Tag Reader Module fits industrial automation, warehouse systems, and large-scale IoT deployments.
CYKEO CYKEO-M8L module RFID is a compact industrial UHF module built for dense tag and multi-antenna environments. With 8 RF ports, adjustable 33 dBm output, and ISO & GB protocol support, it is widely used in factories, warehouses, and automated tracking systems.
CYKEOCYKEO-M4L UHF RFID Module is a compact 4-channel RFID tag reader module designed for dense tag environments. Supporting ISO and GB protocols, it delivers stable reads up to 10 meters for industrial and IoT systems.
Cykeo CYKEO-A11 UHF RFID reader antenna delivers 11dBi gain, 840-960MHz frequency range, and IP65 ruggedness for retail, logistics, and industrial RFID systems. Features low VSWR and easy installation.
CYKEO Antenna RFID Reader delivers stable long-range UHF performance with a 10.5dBi directional design, built for warehouses, conveyor portals, and industrial RFID systems. This rfid reader antenna provides 20m+ read distance and rugged IP67 protection.
Cykeo CYKEO-PHF3 industrial HF RFID Antenna offers 24-point dynamic tracking, ISO 14443A/15693 protocols, metal-environment stability for archives/libraries/manufacturing.
Cykeo CYKEO-A5B industrial Linear RFID Antenna delivers 5dBi gain, ≤1.5:1 VSWR, and IP65 rugged design for warehouse, production line, and logistics UHF systems.
Cykeo’s CYKEO-B12 Long Range RFID Antenna delivers 15m+ read range with 12dBi gain, IP65 rugged design, and global 840-960MHz UHF support. Ideal for warehouse/logistics asset tracking.
Cykeo CYKEO-B10 Long Distance RFID Antenna offers 10dBi gain, 840-960MHz frequency range, IP65 rating, and 20m+ coverage for logistics/warehousing/ETC systems. Low VSWR ensures stable signal transmission.
Cykeo CYKEO-A6 UHF RFID panel antenna features 6dBi gain, 840-960MHz broadband, IP65 metal-ready housing for logistics/smart retail. 18mm ultra-thin design with tool-free mounting.
Cykeo CK-A3 industrial antenna RFID UHF offers 5m+ tag detection, ≤1.3:1 VSWR, IP65 rugged design, and global UHF spectrum compatibility (840-960MHz) for warehouses, factories, and retail.
Cykeo CYKEO-B5 directional RFID antenna provides 5dBi gain with 60° narrow beamwidth for precise inventory tracking. IP65-rated, global UHF frequency support, and low VSWR.
Create your own high-performance DIY RFID antenna! 5dBi gain, 840-960MHz tunable, step-by-step guides. Compatible with Arduino, Raspberry Pi, and commercial UHF readers.
Cykeo CYKEO-A7 Flexible RFID Antenna features 840-960MHz wideband tuning, 7dBi gain, and IP68 rating for medical/retail/industrial curved surface deployments. 98% read accuracy with peel-and-stick installation.
Cykeo CYKEO-B5A industrial Passive RFID Antenna delivers 5dBi gain, 70° beamwidth, and -40°C~55°C operation for warehouses/smart cabinets. Compatible with Zebra/Impinj readers.
Cykeo’s CYKEO-A9B High Gain RFID Antenna delivers 15m+ read range with 9dBi amplification. Features IP54 rugged design, 840-960MHz bandwidth, and 80° beamwidth for warehouse/manufacturing RFID systems.
Cykeo’s enterprise-grade 8dbi Impinj RFID Antenna 10m+ read range with 840-960MHz tuning. Features IP65 housing, 1.4 VSWR, 35° beamwidth for retail/warehouse RFID systems.
Cykeo CYKEO-A9 industrial UHF RFID antenna delivers 9dBi gain, 840-960MHz frequency range, and IP65 protection for warehouse/logistics/retail RFID systems. Features N-type connector and ≤1.3:1 VSWR.
CYKEO UHF RFID Antenna built for long-distance and industrial applications. This antenna rfid uhf delivers strong gain, outdoor durability, and reliable tag performance in warehouses, yards, and vehicle ID systems.
CYKEO Antenna RFID delivers reliable long-range UHF performance in warehouses, retail shelves, and cold-chain environments. This compact uhf rfid antenna provides stable reads with circular polarization and ultra-wide 840–960 MHz support, ideal for industrial tracking, smart shelves, and asset monitoring.
Cykeo’s CYKEO-C8 UHF RFID antennas delivers 8dBi gain, 840-960MHz full-band coverage, and IP65 ruggedness for manufacturing/warehouse RFID systems. Industrial RFID Antennas Features
Cykeo’s 8dBi UHF RFID antenna and reader kit delivers 10m+ range, 840-960MHz broadband, and IP65 ruggedness for factories, warehouses, and logistics. ISO 18000-6C & EPC Gen2 certified.
Cykeo CYKEO-A9A industrial UHF RFID reader and antenna kit delivers 10m range, 500 tags/sec, IP65 ruggedness for manufacturing/logistics. Supports EPC Gen2, ISO18000-6C.
Cykeo’s CYKEO-A12C UHF Large RFID Antenna delivers 12dBi gain, 840-960MHz global frequency, IP65 ruggedness for logistics/warehousing/automotive. 40° beamwidth ensures stable 15m+ tag reads.
CYKEO Near Field RFID Antenna provides precise 5–30 cm reading for shelves, cabinets, and workstations. This compact rfid shelf antenna delivers stable short-range performance around metal and clutter, ideal for pharmacies, libraries, and electronics sorting.
Cykeo CYKEO-B9 UHF Bluetooth handheld RFID scanner features 12m UHF range, 200+ tags/sec scanning, IP67 rugged design for retail/warehouse/pharma. Supports Android SDK & real-time Bluetooth 5.0 transmission.
Cykeo CYKEO-B4 UHF Handheld RFID Reader scanner delivers 1300 tags/sec reading, 30m UHF range, and 12-hour battery life. IP65 rugged design with barcode/NFC/ID scanning for retail/manufacturing/logistics.
Cykeo CYKEO-B2 industrial UHF RFID handheld Scanner offers 10m range, 500 tags/sec scanning, Android 11 OS, and IP65 rugged design for retail/warehouse/manufacturing.
Cykeo CYKEO-B3 industrial RFID Reader Handheld, terminal offers 2m read range, multi-protocol scanning (NFC/barcode/ID), Android 10 OS, and IP65 ruggedness for logistics/retail/manufacturing.
Cykeo CYKEO-B3L industrial handheld UHF RFID Reader terminal features 20m read range, 500 tags/sec scanning, Android 13 OS, 12-hour battery for logistics/retail/manufacturing. Supports barcode/NFC/ID reading.
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