xDF2 DESFire EV2 8kB NFC

  • 13.56MHz ISO14443A & NFC Type 4 chip
  • Huge 8kB multi-application memory space
  • 3x13mm cylindrical sterile bioglass implant
  • RFID Diagnostic Card and xLED-HF included!

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$139.00 $90.35

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WARNING This kit definitely contains dangerous things. While the xDF2 chip has undergone several quality checks during manufacture and has been put through a battery of tests, it has not been certified by any government regulatory agency for implantation or use inside the human body. Use of this device is strictly at your own risk.

The xDF2 NFC chip implant is an ISO14443A NFC Type 4 compliant transponder. It works with NFC enabled smartphones, certain commercial access control systems, various ISO14443A compatible door locks, as well as USB contactless ISO14443A readers. The DESFire EV2 is a very powerful chip, capable of doing much more than simply holding NDEF record data for simple NFC applications. The true utility of this chip is best utilized by programmers and engineers, but there’s also nothing wrong with storing a lot of NDEF data on it either. The xDF2 has enough space you could store a vCard digital business card complete with all your contact information and even a small photo of yourself on this chip with space to spare!

The xDF2 also comes with some additional goodies, including a xLED-HF field tester, and the RFID Diagnostic Card. The RFID Diagnostic Card is a nifty little tool you can use to easily detect what frequency and duty cycle any contactless reader is operating at. What it does not do is tell you where and how to place your xDF2 on the reader to get the best performance. That is where the xLED-HF Field Tester comes in. Place the xLED-HF up to a 13.56MHz reader and begin moving over the surface of the reader while trying different rotational orientations. Once the white LED inside lights up you will know that placing your xDF2 up to that reader in the same location and orientation will yield the best performance.

Important Things To Know

Please expand the sections below to read up on things like performance expectations, return policy, installation procedure, etc.

xDF2 Chip Specifications
  • 13.56MHz ISO14443A & NFC Type 4 DESFire EV2 RFID chipset
  • Full datasheet for the NXP DESFire EV2 RFID/NFC chip
  • 7 byte UID and 8K bytes of user read/write memory
  • 25 year data retention. Rated for 500k writes per memory block.
  • Encased in 3mm by 13mm bioglass with non-toxic epoxy
  • Pre-tested and pre-loaded into sterile injection assembly
  • No “anti-migration” coating means easy removal/replacement

DESFire EV2 chip specifications include

  • Common Criteria certification: EAL5+ (Hardware and Software)
  • Optional RANDOM UID for enhance security and privacy
  • Mutual three pass authentication
  • Mutual authentication according to ISO/IEC 7816-4
  • Flexible keys: 1 card master key and up to 14 keys per application
  • Hardware DES using 56/112/168 bit keys featuring key version
  • Hardware AES using 128-bit keys featuring key version
  • Data authenticity by 8 byte CMAC
  • Data encryption on RF-channel
  • Authentication on application level
  • Hardware exception sensors
  • Self-securing file system
  • Backward compatibility to MF3ICD40: 4 byte MAC, CRC 16

ISO/IEC 7816 features

  • File structure (selection by File ID or DF name)
  • APDU message structure
  • APDU wrapper for MIFARE DESFire native commands
  • INS code ‘A4’ for SELECT FILE
  • INS code ‘B0’ for READ BINARY
  • INS code ‘D6’ for UPDATE BINARY
  • INS code ‘B2’ for READ RECORDS
  • INS code ‘E2’ for APPEND RECORD
  • INS code ’84’ for GET CHALLENGE
  • INS code ’88’ for INTERNAL AUTHENTICATE
  • INS code ’82’ for EXTERNAL AUTHENTICATE

Interesting DESFire EV2 features

Testing process, return policy, lifetime warranty
Testing Process
Our x-series chips come pre-loaded inside injector systems with steel needles and cannot typically be read while inside the needle. Because of this, we perform a full test on every x-series tag before it is loaded into the injector assembly and sterilized. We have also conducted several tests on our x-series chips and cataloged those tests here.

Return Policy
We offer a 30-day money back guarantee! Read all about it on our return policy page.

Lifetime Warranty
If you do purchase one of our products and experience a failure, we offer a full lifetime warranty on all of our products. You will need to return the product for testing and analysis, and if it is malfunctioning, we will ship you a replacement free of charge. Read all about it on our warranty policy page.

Practical read range/performance expectation
Passive RFID and NFC chips are magnetically coupled devices that power themselves and communicate data over a shared magnetic field the reader generates. This means their effective read range and performance depends entirely on how well the antenna coils of both the tag and reader couple with each other. This typically means the shape, size, and orientation of both antennas must be complimentary.

Unfortunately, most reader devices, including mobile phones, typically have antennas designed with thin PCB traces made into blocky rectangular shapes that lay along a flat plane. These antenna designs are great for coupling with and reading large flat labels and access cards which also share this antenna shape, but they have a hard time coupling to the very small cylindrical antenna coil inside our x-series chips. Most mobile phones and reader devices have a “sweet spot” or two that must be located and used each time to get consistent results. Other devices, such as the Samsung Ezon electronic deadbolt lock, sometimes use wire wound coil antenna loops inside, which work much more reliably with small glass transponders like our x-series chips. You should not expect your USB reader or mobile device to achieve the same read range with our x-series chips that you normally get with a label tag or card style tag. Here are some example videos detailing typical read performance and how to find that “sweet spot”.

The xLED can help! The xLED is a diagnostic device that mimics the x-series antenna coil winding and shows you the best possible location and rotation/orientation for holding your x-series transponder up to any reader. That’s why we include it in our deluxe bundle!


How/where are x-series chips installed? Aftercare? What to expect?
Our x-series transponders are typically installed into the webbing between the metacarpal bones of the index finger and thumb, resting parallel to the index metacarpal. The reason they are installed in the hand has to do with the extremely short read range of x-series chips and the typical use case being some form of access control where the tag must be presented to a fixed reader of some kind. The suggested placement within the hand was chosen due to the lack of major nerve bundles or blood vessels running through that area.

Achieving a safe installation definitely requires a steady hand and experience performing aseptic procedures. Dangerous Things prefers our customers locate one of our professional body piercing or body modification partners to complete the installation of this product. If no partners are available in your area, you should be able to follow this guide to finding a professional in your area who is willing to assist you. For aftercare information and what to expect, please read our X-Series FAQ page.

Can I get an MRI? What about airport security? Playing sports? etc.
You have questions! That’s understandable. The short answer is; it’s all good. If you’re looking for more specific answers, we have an extensive FAQ page that deals with many of the most commonly asked questions regarding installation of our x-series transponders.