The xEM chip is an emulator that can behave like many different common low frequency chip types, including EM41xx, EM4200, HID 1326 ProxCard II, HID 1346 ProxCard III, Indala, Pyramid, Viking, AMV, Presco (and more) access cards and keyfobs. The xEM is a great introductory chip for people just getting into RFID projects.
WARNING: This kit definitely contains dangerous things. While the xEM transponder device has undergone several quality checks during manufacturing, 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 kit contains the tag and all the sterile procedure materials required for a professional to perform installation.