【programmable 】Advanced pre-setting one week before. Digital electronic timer switch with daily programs. Repeat programs with 17 on/off setting and manual over-ride. 【AC/DC】Lithium battery power reserve when electric supply cut off. AC/DC power available. 【auto error correction】This timer has auto error correction +30sec,weekly. With high precision and strong anti-interference ability, 【easy to mount】This timer adopted panel mounted design, can be mount on the wall easily and tightly. 【wide applications】This timer switch could automatic turn on/off all kinds of electric equipment according to the time user set. Suit for controlling street lamps, neon lamps, production equipment, radio and television and many other home appliances.