|Master PIR Sensor. 5 Minute timer. Choose from either 12 or 24 volts. 140mm (L) x 100mm (W) x 20mm (D). Detects the movement of body heat in order to activate the sensor. Once the sensor has been triggered the timer will automatically switch the connected device on, until no movement is detected, a 5 minute timer will then start. Low energy consumption. Slim profile.