You can use the timer to turn on or off electrical devices at a preset time. 16 on/off programs per day, with up to 15 combinations per week. 24 hours, 7 days a week programmable. Built-in battery backup to retain memory and settings during power outages. Automatic time error correction of up to +/- 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 deviation correction, weekly 5. Sleep mode Usage: The TM618 timer module, with a 1.598-inch large LCD display, can automatically turn on or off various electrical devices and power sources according to preset times. Suitable for use with streetlights, neon signs, household appliances, broadcast equipment, and more. The digital timer switch includes a rechargeable battery (1.2V/40mA) and a high-accuracy CMOS chip, offering strong anti-interference performance and ease of use. 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: Lighting and display differences may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement error allowance is +/- 1-3 cm.