Photoelectric Power Board, Smoke Detector, Alarm Current 135mA RMS @ 24V AC, 35mA RMS @ 120V AC, 65mA @ 24V DC, Depth (In.) 2 1/2 in, Height (In.) 5 in, Length (In.) 7 3/4 in, Ambient Temp. Limits (F) -4 Degrees to 158 Degrees F, Air Velocity (FPM) 100 to 4000 fpm, Alarm Aux. Contact @ 250V 10 A, Alarm Aux. Contact @ 30VDC 10 A, Humidity Range ( Percent RH) 0 to 95 Percent RH, Number Required 1, Standby State (mA) Max 21mA @24V DC/ Max 65mA RMS @24V AC/ Max 20mA RMS @120V AC, Voltage 24/120