RFIDa - RFID Technology: Active RFID Tag: AeroScout T3 Advances Track and Trace

AeroScout Inc. introduces its AeroScout T3 Tag, an advanced, active RFID tag for asset and people track and trace applications. New features are: Small size credit-card rugged form factor; Efficient power consumption provides efficient use of battery life up to 4 years; Seamless indoor-outdoor reliability provides integrated RSSI (Received Signal Strength Indication) and TDOA (Time Difference of Arrival) location options; And, choke point detection capability that enables the active RFID tag to be triggered at doorways, gateways or enclosed areas. ...

http://www.rfida.com/weblog/2007/02/active-rfid-tag-aeroscout-t3-advances.htm