This timer switch could automatic turn on/off all kinds of electric equipment according to the time user set. It has a built-in rechargeable battery and a industrial grade chip. With high precision and strong anti-interference ability, the timer switch is great for controlling street lamps, neon lamps, production equipment, radio and television and many other home appliances. Specifications: Input Voltage: 230 Volt Contact Voltage Rating: AC 180V to 260V(50/60Hz) Load Capacity: 16 Amp 250VAC(resistive load) On/Off Operation: 16 on and 16 off(manual/auto) Display: LCD Power: 4.5VA(max) Error: =2s/day(25?) Mounting Method: DIN rail(not included) Bound: 1 min to 168 hours Operating Temperature: -10? to 55? Size: 86 x 36 x 65mm / 3.38 x 1.41 x 2.56" Quantity: 1 Instruction: 1, When you use the timer switch for the first time, input AC and charge the inbuilt battery please, then press reset button. 2, The timer switch is at 24-hour mode as default. Press and hold "time" button(bottom left, next to "reset") for 5 seconds till it display "AM" to set to 12-hour mode. Press and hold again "time" button for 5 seconds to set back to 24-hour mode. 3. Full time clock setting (see more at User manual ) Package Includes: 1 x Timer Switch 1 x User Manual