xNT NFC Tag [NTAG216]

  • xNT tag – 13.56MHz ISO14443A & NFC Type 2 NTAG216 chip
  • 2x12mm cylindrical sterile biocompatible implant package
  • ISO14443A – compatible with all ISO14443A RFID systems
  • Fully NFC Type 2 compliant – compatible with all NFC devices

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SKU: 851294007004 Category:

More Details

WARNING This kit definitely contains dangerous things. While the xNT transponder device has undergone several quality checks during manufacture and has been put through a battery of tests with various private labs, it has not been tested or 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 xNT tag was designed by Dangerous Things and production of it was successfully crowdfunded via an Indiegogo campaign. The xNT can be read and written to by many types of ISO14443A based RFID systems, and all NFC compliant reader/writer devices including USB devices and all NFC capable mobile phones. Click here for a list of compatible products.

xNT Standard Kit Option

Kit Contents:

  • 1 sterile injector assembly, pre-loaded with an xNT tag
  • 2 single use ChloraPrep swabs (video)
  • 1 sterile gauze pad for post-injection wound care
  • 1 sterile expandable-fabric adhesive bandage
  • 1 pair of non-sterile, non-latex procedure gloves

Why You’d Want This

The xNT kit contains the xNT tag and all the sterile procedure materials required to perform installation. The xNT tag is made with the 13.56MHz ISO14443-A and NFC Type 2 compliant NTAG216 chip, which is encased in a biologically safe 2x12mm cylindrical bioglass tube. The bioglass cylinder is laser sealed and the finished xNT tag is tested for function before loading into the injector assembly, and the whole injector assembly with xNT tag inside is EO gas sterilized.

NFC Bundle Kit Option

Kit Contents:

  • 1 Standard xNT Kit
  • 1 RFID Diagnostic Card
  • 1 xLED 13.56MHz Field Tester

Why You’d Want This

Get the xNT implant kit plus our xLED field tester and diagnostic card bundled together! Our diagnostic card will tell you all about the frequency and duty cycles of random readers you encounter in the wild, while our xLED field tester will show you the best position and orientation to present your xNT implant to any compatible HF reader.

This bundled value represents 13.5% or a $18 discount off the retail price of $133 if these items were purchased separately!

NFC Complete Bundle Kit Option

Kit Contents:

  • 1 Standard xNT Kit
  • 1 RFID Diagnostic Card
  • 1 xLED 13,56MHz Field Tester
  • Dangerous KBR1 Keyboard Wedge Reader
  • PN532 NFC Reader Module

Get the xNT implant kit plus our complete NFC bundle. Our diagnostic card tells you the frequency and duty cycle of any random readers you encounter in the wild, while the xLED shows the best position and orientation to present your xNT implant to any compatible HF reader. The KBR1 will output the UID serial number of your xNT as if it were typed by the keyboard, enabling a simple computer logon solution. The PN532 is an Arduino compatible reader module that can enable your custom project to read your xNT implant!

This bundled value represents 13.5% or a $27 discount off the retail price of $201 if these items were purchased separately!


Important Things To Know

xNT Tag Specifications
  • 13.56MHz ISO14443A & NFC Type 2 compliant NTAG216 RFID chipset
  • Full datasheet for the NXP NTAG216 RFID/NFC chip
  • 7 byte UID and 880 bytes of user read/write memory
  • 10 year data retention. Rated for 100k writes per memory block.
  • Encased in 2.1mm by 12mm bioglass with non-toxic epoxy
  • Pre-tested and pre-loaded in sterile injection assembly
  • No “anti-migration” coating means easy removal/replacement
How/where are x-series tags installed? Aftercare? What to expect?
hand nervesOur 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 tags 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.

Piercer installing x-series transponderAchieving 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.
Practical read range/performance expectation
magnetic-fieldPassive RFID and NFC tags 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 label tags, credit card style tags, 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 tags. 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 tags like our x-series tags. You should not expect your USB reader or mobile device to achieve the same read range with our x-series tags 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 signal 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. This video explains how it works.
Click here to order the xLED-HF (13.56MHz).

Securing your xNT - first steps after installation
The xNT uses the NTAG216 chip from NXP, which was designed for use in more typical NFC applications such as smart posters, labels, and other disposable use cases where the memory contents would typically be written and then locked so it could not be changed. This is done using built-in “lock bytes” which are OTP (one time programmable). That means that once the lock bytes are turned on to protect memory blocks, they can never be unlocked. Once any memory block is locked, it will forever be read-only, which is not ideal for the xNT. Many NFC applications offer ways to “lock” or “protect” your tag, which will end up locking the tag read-only.

In addition to lock bytes, the NTAG216 offers a 32bit password protection function. Regardless of what some NFC smartphone apps indicate, it is not possible to remove or disable the password. It is only possible to set the password to the default value of FF FF FF FF. If the password is set to the default value, then anyone could easily authenticate, change the password, then write data or change protection options for your tag, and either permanently lock the tag or just change the password to some unknown value. Because it is also possible to protect memory blocks from unauthenticated reads using a password, this could make the tag completely useless by not allowing any memory blocks to even be read.

Finally, many of the critical configuration bytes used by the NTAG216 chip are stored in the last few memory pages of the tag. This means that it may be possible for an NFC application that does not properly detect or honor the xNT’s memory schema to accidentally attempt to write NDEF record data (the data you’re trying to store on the tag) overtop of the configuration bytes. For example, if the data you are attempting to write is longer than the user memory blocks available, the remainder of the data might be written overtop of configuration bytes, which contain settings that are potentially dangerous to modify such as the config lock byte. The configuration lock byte is not possible to disable, so accidentally writing to that byte could result in your configuration being irreversibly locked.

To help our customers protect their tag from accidental modification or malicious attack, we have developed Dangerous NFC for Android. Our DNFC app allows customers to secure their tag by doing the following things;

  • Disable lock bytes so they cannot be used to lock any memory blocks as read-only
  • Update the password block with a custom, non-default password value
  • Update the memory protection option to write-only protection
  • Update the memory protection range to protect the configuration bytes


This approach allows the entire user memory space to be written to/updated, while at the same time protecting the configuration bytes and password values at the bottom end of the xNT memory space. This means an application cannot accidentally write data unintentionally to any configuration bytes. It also means the password of the xNT cannot be updated without first authenticating. This means you will need the current password in order to update or change the password. Without updating the dynamic memory protection range, it would technically be possible to just write a new password without first knowing the old password.

Ultimately, once secured by Dangerous NFC, you are free to use any other NFC app to write data to the tag and not need to be afraid of accidentally locking the tag, or changing the configuration bytes, or someone maliciously locking your tag or changing your password. We suggest using NXP’s TagWriter app.

Tag testing process, return policy, lifetime warranty
Testing Process
Our x-series tags come pre-loaded inside injector systems with steel needles and cannot 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 tags and cataloged those tests here.

Return Policy
All sales of this product are final and no returns will be accepted. Tight controls are maintained over chain of custody through manufacture, sterilization, and shipment. We would not want to re-sell something that has been returned, and you probably wouldn’t want to buy one either… so before you purchase, do your research and be sure you know you’re getting the correct product, know it’s compatibility/performance/limitations/etc.

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.