120-277-Volt Programmable Twist-Lock Photocell Automatically adjusts to daylight savings time Multi-Voltage 120-240 Volt, 15-Amp, 1800-Watt; NEMA 3-prong twist-lock receptacle Works with mercury vapor, sodium vapor, metal halide, CFL, LED, incandescent and halogen bulbs Rugged outdoor operating temperature range: -40F to +158F (or -40C to +70C)