110-277V Heavy Duty Twist-Lock Photocell with Surge Arrestor Ideal for outdoor lights, lawn lights, indoor lights, building perimeter lights, walkway and parking lights UL listed for safe use in the USA and Canada with mercury vapor, sodium vapor, metal halide, CFL, LED, incandescent and halogen bulbs One unit works with 120V, 208V, 240V & 277V rated fixtures Rugged outdoor operating temperature range: -40F to +158F (or -40C to +70C) with an excellent On/Off ratio of 6 and low average power consumption: 0.8W