Power Pack, Fixture Sensor, 120/277/347Vac 60Hz Input, Form C Relay, 12-18AWG Screw Terminals, White ABS, f/ Low Voltage Fixture Sensors, ON/OFF & Stepped Dimming Control, 0 to 55C, 21.14 LG x 19.72 WD x 10.31 HT in, RoHS