Welcome to our store! 1. If the timer switch power is insufficient, simply replace the battery. 2. This is a programmable timer switch; set a schedule to control your appliances, featuring a convenient backlight. 3. The timer switch offers 24-hour intelligent analog timing, allowing for 16 on/off settings per day. 4. With a long operating time of 1 minute to 168 hours, you won't have to worry about power. 5. Save energy and money, reducing electricity bills. Ideal for lamps, ceiling fans, and more. Specification Item Type: Digital Analog Timer Switch Material: ABS Model: TM928AK Display Mode: LCD Backlight Operating Voltage: 85-265VAC Load: 16A Power Consumption: <5VA Time Range: 1 min - 168 hours Battery Life: 90 days Program: 16 ON/OFF times per day Average Error: <±2 seconds/day Temperature Range: -10-50 ℃ Humidity: <95% Installation Method: DIN RAIL Features: 1. Clock display 2. Programmable timer 3. Backlit display Battery Parameters: Removable CR2032 3V 240mAh button battery Package List: 1 x Switch Note: Use within the 85-265V range. Please allow minor errors due to manual measurement and different monitors. (Customer satisfaction is our top priority. If you encounter any product issues after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.) Thank you for meeting me. I hope this helps you. Wishing you a happy life.