Welcome to our store! 1. If the power to the timer switch is insufficient, simply replace the battery. 2. The timer switch is a programmable timer; set a schedule to control your appliances, and it features a backlight. 3. The timer switch can be used for 24-hour intelligent analog timing, and it can be set ON/OFF 16 times per day. 4. The long working time of 1 minute to 168 hours, so you don't have to worry about power problems. 5. You can save energy and money, as well as electricity bills. You can use it for lamps, ceiling fans, etc. Specifications: Item Type: Digital Analog Timer Switch Material: ABS Model: TM928A Display Mode: LCD Backlight Working Voltage: 85-265VAC Load: 16A Power Consumption: <5W Time Interval: 1min-168hrs Power Failure Memory: 90 days Program: 16 times per day ON/OFF Average Error: <±2 seconds/day Temperature Range: -10-50℃ Humidity: <95% Installation Method: DIN RAIL Features: 1. Clock display 2. Programmable timer 3. With backlight Battery Parameters: Removable button battery CR2032 3V 240mAh Package Includes: 1 x Switch 1 x English User Manual If you receive your item and find any product issues, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.