NSI Tork® Photocontrol, Electronic Instant Response, 400 to 550 VAC, 4 A, 50/60 Hz Frequency, 1000 W Tungsten, 1800 VA Ballast, 360 J Arrester, Instant On and 3 to 5 s Off Timing, Molded Sealed IR Sensor, 1.5 FC (ON)/1.5:1 FC Average (OFF) to (ON) Ratio Sensitivity, Environmental Conditions: -40 to 158 deg F Operating Temperature, 6000 Cycles Operating Cycles, Fixture Mounting, Polycarbonate, Yellow, 2.187 in H x 3.187 in W Dimensions,