The microchip with aerials (technical expression: transponder *) is a sterile, non irritating glass capsule of the size of a rice grain. It corresponds to the valid ISO norm 11784/11785.
A reader device can activate the microchip and read its number code. Each number code is valid worldwide, unique, and cannot be falsified or re-programmed.
The microchip is completely harmless and cannot move under the skin. It cannot be destroyed from the outside nor does it break in case of shock.
* A transponder is a wireless communication device that receives incoming signals and automatically responds to them. The expression 'transponder' is composed of the words 'transmitter' and 'responder'.