It is considered to be a part of the RFID system, which handles the actual management of the data.

Method of communication between readers and passive tags. The transponder refelect shafts of the reader, and its information modulated in these reflected waves.

Beacons are considered to be an active tag used in real time locating systems.

The ruminal bolus is a RFID chip (FDX-B) sealed in a ceramic capsule, which is then placed in the reticulum of the animal