Unlike a barcode, the tag does not need to be within the line of sight of the reader, so it may be embedded in the tracked object.
Active tags are powered by a battery and thus can be read at a greater range from the RFID reader, up to hundreds of meters. Passive tags are powered by energy from the RFID reader's interrogating radio waves.
This number can be used to track inventory goods. When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits digital data, usually an identifying inventory number, back to the reader. An RFID system consists of a tiny radio transponder, a radio receiver and transmitter. Radio-frequency identification ( RFID) uses electromagnetic fields to automatically identify and track tags attached to objects.
