You can use the timer to turn on/off any electrical equipment at a preset time. 16 on/off programs per day, with up to 15 combinations set for a week. Fully programmable for 24 hours, 7 days a week. Built-in battery backup saves memory and retains your settings during power outages. Automatic time error correction within +/- 30 seconds weekly. Repeat programs with 16 on/off settings; manual on/off control available. Features an easy-to-read LCD display and LED indicators. MULTIPURPOSE 7-DAY PROGRAMMABLE TIMER SWITCH WITH FIVE FUNCTIONS: 1. Clock Display 2. Timer 3. Countdown 4. Automatic Time Error Correction, Weekly 5. Sleep Mode Usage: The TM618 timer module features a 1.598-inch large LCD display and can automatically turn connected electrical devices on or off according to preset times. Suitable for applications such as streetlights, neon signs, household appliances, and broadcast equipment. The digital timer switch includes a rechargeable battery (1.2V/40mA) and uses a high-accuracy CMOS chip with strong anti-interference performance. Simple and user-friendly operation. Size: 7.0 cm x 7.0 cm x 4.0 cm Material: ABS + electronic components Color: White Package Contents: 1 x TM618N-4 Switch 1 x User Manual Note: Light and screen display differences may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement allowance is +/- 1-3 cm.