has a digital LCD display allowing user adjustable settings. A photo sensor with user controlled day/night/both button allows user to select the time period that the will operate. A built in rechargeable Ni-MH backup battery stores user settings in case of a power outage or failure. The timers have a wide range of uses including but not limited to: With AC power supply, the icon lights up and works normally. When there is no AC power supply, the icon goes out, the brightness is not detected at this time, and the system enters the standby mode. Working Current: 16A max Brightness Setting Range: 0~99 Built-in Battery: 3.6V Working Temperature: -10℃~40℃ Controlling Hydroponics/Aeroponics Pumps Exhaust fans CO2 generators or tanks Ozone generators etc. Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. Voltage: AC110V Color: As Shown Material: plastic Package Contents: 1 x US-spec light-controlled timer