In the communications mode, the RFID tag uses an internal clock/timer (e.g., clock/timer 214 of FIG. 1) to determine if the WOT has expired. If not [1422:NO], then the first RFID tag performs operations in 1424 to receive and respond to at least one interrogation signal. If so [1422:YES], then method 1400 continues with 1426 of FIG. 14B. As shown in FIG. 14B, 1404-1416 are repeated until a power source (e.g., power source 236 of FIG. 2) has a certain level of charge, a control signal is received from an external device to disable the receiver, and/or other criteria is met. The other criteria can include, but is not limited to, expiration of a time slot or completion of the first RFID tag's communications with a remote tag reader for inventory determination purposes. In 1428, the operational mode of the first RFID tag is transitioned back to the power recharging mode.
