Programmable electronic timer. 1,800 W. 1 HP max. 15 A. 120 V. Photocell mode activates program, when darkness threshold is reached dusk and turns off timer at programmed time. Temperature sensor mode executes programming when temperature falls to - 12° C/10° F, - 6° C/21° F or 3° C/37° F (per user's choice). Sunset/sunrise mode turns timer on at dusk and off at dawn. Rugged, weatherproof construction enables indoor or outdoor use. Easy 3-button programming. Temporary override enables bypass, without affecting programming. Battery-free backup. When used to control a pool pump (run it 12 hours per day, instead of 24), can help reduce your energy bill during summer.