A transponder is an electronic device used to wirelessly
receive and transmit electrical signals. Fittingly, its name is equally derived from the words "transmitter" and "responder".
Transponders were originally developed to be attached to objects which needed
to be located, and are still used in this manner today. A transponder
functions by receiving a signal, called an "interrogator"
because it is effectively "asking" for information, then automatically conveying a
radio wave at a predetermined frequency.
In order to broadcast a
signal on a different frequency than the one received, a
frequency converter is built in. By receiving and transmitting on different frequencies, the interrogator and transponder
signals can be detected simultaneously, thus providing a unique code.
In short, a pet
MicroChip is installed at a point between the shoulder blades or scapula and provides a unique code which is recorded with
the information being stored in a national database which is run by pet-detect, a subsidiary of the Kennel Club.
If your pet is lost or stolen it has a far greater chance of being found if
you have a MicroChip installed in your pet.