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 programmed for the week. Fully programmable for 24 hours, 7 days a week. Built-in battery backup saves memory and retains settings during power outages. Automatic time error correction of +/- 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, featuring a 1.598-inch large LCD display, can automatically turn electrical devices on or off according to preset times. Compatible with various applications such as streetlights, neon signs, household appliances, and broadcasting equipment. The digital timer switch includes a rechargeable battery (1.2V/40mAh) 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 screen differences may cause slight color variations between the image and the actual item. Measurement allows for a 1-3 cm deviation.