Radio Frequency Identification (RFID) is a form of wireless communication that uses electromagnetic or electrostatic coupling in the radio frequency portion of the electromagnetic spectrum to uniquely identify objects. Every RFID system consists of an antenna, a transceiver, and a transponder (i.e., the RFID tag). The combination of the antenna and transceiver is RFID reader, which can be stationary or mobile.
The read range for RFID tags varies based on factors including: the type of tag, type of reader, RFID frequency and interference in the surrounding environment or from other RFID tags and readers. Tags that have a stronger power source also have a longer read range.