Welcome to our store! 1. When the power of the timer switch is insufficient, you only need to replace the battery. 2. The timer switch is a programmable timer, set a schedule to control your appliances and features a backlight. 3. The timer switch can be used for 24-hour intelligent analog timing, and it can be turned on/off 16 times a day. 4. The long working time from 1 minute to 168 hours, so you don't have to worry about power issues. 5. You can save energy and money, as well as electricity bills. You can use it for lights, ceiling fans, etc. Item Type: Digital Analog Timer Switch Material: ABS Model: TM928AK Display Mode: LCD Backlight Working Voltage: 85-265VAC Load: 16A Power Consumption: <5VA Time Range: 1 min-168 hours Power Failure Memory: 90 days Programs: 16 times a 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 1 x Switch 1 x English User Manual Customers are our top priority. If you encounter any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.