RFID is the abbreviation of radio frequency identification technology. This involves several tags or chip to transmit the information to the reader device. There are two kinds of RFID tags such as active and passive tags. Active tags are expensive and they require electricity to run. On the contrary passive tags do not require electricity to run.
Electromagnetic fields are used in the RFID technology for detecting and tracking the tags that are linked to the objects. You may search for the RFID chip timing Tempe Arizona on the Internet for obtaining more information on this subject.