Function: 1. With countdown function, maximum 24 hours countdown to shutdown. 2. 35mm DIN rail mounting, easy to operate, great for home use. 3. Supports programmable 24 hours/7 days a week. 4. LCD digital display, LED indicator, reading is more intuitive and clear. 5. 16 ON/OFF programs per day, 15 combinations per week. 6. Built-in high-capacity CR2450 battery for memory backup (saving set programs) in case of power failure. 7. Repeat programs with 16 on / off settings and manual on / off. Specification: Item Type: Time Switch Material: plastic Color: as shown in the picture Functions: Clock display (12-hour/24-hour format) Timer Counting down Power supply: 12V DC Capacity: 30A 5000W Time range: 1min-168 hours Programs: 16 ON /OFF daily Power consumption: <5VA Average error: <2S/day Temperature range: -10-50 Humidity: <95% Package List: 1 x time switch 1 x Manual Note: This product is a built-in battery.