3-prong, grounded timer outlet is CE certified and thoroughly tested for quality and safety Our digital timer runs smoothly and silently, quitter than most mechanical timers Equipped with large LCD display and attached with a detled manual, convenient for your operation. Up to 10 times programmable ON/OFF setting per 24 Hours/ 7 days, and the setting time within 1 minute. Every program you set repeats once each week. Allows randomly turning on/off lights within the specific time that you set, helps to prevent burglars. With the built-in battery backup, the unit retains the programing even in a power outage, and save the trouble to reprogram. This timer plug is perfect for devices that need to be turn on/off periodically. Home lighting, heater, A/C, kitchen appliances, aquariums, Christmas tree and other electrical appliances, fans, Hydroponics, watering, ventilation/temperature control system, farm lighting/kitchen/garden, watering system and so on.