The radio transmitter module STM 320 from EnOcean enables the implementation of a wireless magnet contact sensor.

Powered by a solar cell it works absolutely maintenance free. An integrated energy store allows operation for several days even in total darkness.Key applications are window and door sensors. 

Functional Principle

The STM 320 supervises an integrated reed contact and reports every status change immediately (open<>closed). In addition a sign of life signal is transmitted every 20-30 minutes.