waht is RFID glass capsule

This is a glass capsule, cylindrical RFID tag; it's very similar to those implanted into pets for identification purposes. But really guys, it's not for use inside your body. Please don't implant this thing into yourselves. Each tag comes with a unique 32-bit ID code and is not reprogrammable. The carrier frequency of this tag is 125kHz, so it works great with our ID-2, ID-12 and ID-20 RFID readers.
This is a glass, cylindrical RFID tag; it's very similar to those implanted into pets for identification purposes. Each tag comes with a unique 32-bit ID code and is not reprogrammable. The carrier frequency of this tag is 125kHz, so it works great with our ID-2, ID-12 and ID-20 RFID readers.

The RFID glass capsule sometimes we call RFID glass tag which is produced by adopting material and process complied with chemical and biological medical materials. It is fully comply with ISO117784/85. The tags having been largely used in the world and effectively controls rabies and overall management of animal’s living progress. Once the antenna of the reader is close to the inter-implantation site, the tag can be read.
There are two kinds of this tag, one can only read and the other can read & write types. The RFID glass capsule has the maximum memory space of 2k bits

We tested this RFID tag with one of our ID-12 readers and measured a maximum read distance of about 10mm.
 We do not recommend this device for implantation inside humans or animals without extensive surgical and sterilisation procedure knowledge on behalf of the user. The device has glass parts, which if positioned incorrectly could cause harm if broken. Infection caused by an unsterilised RFID tag could cause serious medical problems with dire consequences.

http://www.nfcandrfid.com/products_info/RFID-glass-capsule-315458.html