You can use the timer to switch on/off any electrical equipment at a preset time. 16 on/off programs per day, 15 combinations for a week. 24 hours / 7 days a week programmable. Built-in battery for memory backup (saves your settings) during power failure. Automatic time error correction within +/- 30 seconds weekly. Repeat programs with 16 on/off settings; manual on/off control available. Easy-to-read LCD display with 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 (1.598-inch large LCD display) can automatically turn on or off various electrical devices ing to preset times. Suitable for streetlights, neon signs, household appliances, broadcast equipment, and more. The digital timer switch includes a rechargeable battery (1.2V/40mAh) and features a high-accuracy CMOS chip with strong anti-interference performance and easy 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 color variation between the image and the actual item. Measurement allows an error of +/- 1-3 cm.