AVTECH's Relay Switch Sensor allows low voltage devices to be turned on/off in response to an event going in or out of an alarm condition. The AVTECH Relay Switch Sensor can toggle up to 4 devices. It is compatible with AVTECH's Room Alert 32W, 32E, 12E or 3E environment monitors Via AVTECH's Light Tower & Relay Adapter (LTA). The Relay Switch Sensor is compatible with the Room Alert 4E via a direct connection.