TX-3DS : Door/Window Sensor

 The TX-3DS is a fully supervised
 magnetic contact transmitter.
 With a built-in reed switch it can
 be used to secure doors and
 windows.

 Specification:

 Supervision:
 Sends heartbeat signal
 at 60-minute interval.

 Power Source:
 Two AAA alkaline batteries.

 Current Drain:
 5uA @ standby, 20mA

 Estimated Battery Life: 3 years