Features Built-in high-performance battery is used as a backup power supply to maintain the timing, display and data storage in case of no external power supply,high strength, high cost performance. With strong anti-interfere rejection, stable performance,Easy to use, Suitable for novice or professional use. This product can automatically switch on and off the power of various powered devices according to the time set by the user. Suitable for the automatic control of street lamp, advertising sign lamp, production device, broadcast television device and other power devices. Adopt high precision industrial grade chip for accurate timing control,very popular. Specification: Working voltage: AC-DC 12/24/110/220V ( Optional ) Switching capacity: 30A Number of settings: 16 times ON and OFF(day/week) Setting time: 1 minute - 168 hours Time-keeping error: 1s/24h Power-off memory: 180 days or more Battery: Built-in 1.2V 40mA rechargeable battery Mounting method: Screw mounting or rail mounting Dimensions: 86*36*66mm / 3.4*1.4*2.6 Weight: Approx. 145g/5.1oz    Package L ist: 1 * Digital Timer Switch   Note : 1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding. Package List