RFID tag having multiple transceivers

A method of communicating information between an RFID tag and first and second readers, the method comprising:

• controlling a first transceiver of the RFID tag so that the first transceiver communicates with the first reader and so that the first transceiver has substantially longer periods during which the first transceiver cannot communicate with the first reader than when the first transceiver can communicate with the first reader;
• and,
• controlling a second transceiver of the RFID tag so that the second transceiver communicates with the second reader at least during the periods when the first transceiver cannot communicate with the first reader.

A method of communicating information between an RFID tag and first and second readers, the method comprising:

• controlling a first transceiver of the RFID tag so that the first transceiver communicates with the first reader and so that the first transceiver has substantially longer periods during which the first transceiver is not in communication with the first reader than when the first transceiver is in communication with the first reader, wherein at least some communications between the RFID tag and the first reader are conducted in message frames, wherein each of the message frames comprises a header and a time slot, wherein the header is transmitted by the first reader, and wherein the first transceiver is controlled so as to transmit data in the time slot;
• and,
• controlling a second transceiver of the RFID tag so that the second transceiver communicates with the second reader at least during the periods when the first transceiver is not in communication with the first reader.