THECONFIDENTIALFREQUENCIES20120425
for the purposes of automatic identification and tracking. Some tags require no battery and are powered by the electromagnetic fields used to read them. Others use a local power source and emit radio , Radio-frequency identification (RFID) is the use of a wireless non-contact system that uses radio-frequency electromagnetic fields to transfer data from a tag attached to an object, the tag does not need to be within line of sight of the reader and may be embedded in the tracked object.