An RFID system consists of a tag, which is made up of a microchip with an antenna, and an interrogator or reader with an antenna. The reader sends out electromagnetic waves. The tag antenna is tuned to receive these waves. A passive RFID tag draws power from field created by the reader and uses it to power the microchip’s circuits. The chip then modulates the waves that the tag sends back to the reader and the reader converts the new waves into digital data.
RFID tag has a microchip and antenna. GearEye's dongle, which is a compact RFID reader, sends electromagnetic waves to all the tags around. Then all the IDs received back are passed to the GearEye Mobile app and associated with different objects