ProgrammableAdvanced preset one week ahead. Digital electronic timer with daily programs. Repeat programs with 17 on/off and manual override. AC/DCLithium battery power reserve when power supply is off. AC/DC power supply available. Automatic error correctionThis timer has automatic error correction + 30s, weekly. With high precision and strong anti-interference ability. Easy to mountThis timer adopted panel-mounted design, which can be mounted on the wall easily and firmly. Wide applications This timer switch can automatically turn on/off all kinds of electrical equipment according to the time set by the user. Combination for controlling street lights, neon lights, production equipment, radio and television and many other household appliances.