1. Use the timer to turn on/off all electrical devices with a preset timer 2. 16 on/off programs per day, 15 combinations per week. Programmable 24 hours/7 days a week. 3. Built-in battery for memory backup (save the programs you set) when power is off. Automatic time deviation correction +/- 30 seconds, weekly. 5. Repeat programs with 16 on/off settings, and manual on/off adjustment. Easy-to-read LCD display, LED indicators. MULTIPURPOSE 7 PROGRAMMABLE TIMER SWITCH HAS FIVE FUNCTIONS: 1. CLOCK DISPLAY 2. TIMER 3. COUNTDOWN 4. AUTOMATIC TIME CORRECTION, WEEKLY 5. SÖLMÄGE: TM618 timer module (1.598 inch LCD screen) can open or close various types of electrical appliances and power automatically, depending on the preset time. The items can be street lights, lights (signs), electrical appliances, transmission equipment, etc. The digital timer switch is housed in a rechargeable battery, 1.2V/40Ma, CMOS chip with high precision, strong anti-jamming, easy to 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 Only the above package contents are included; other products are not part of the set. Note: The image is for reference only; please check the actual product. Thank you! (Excludes keys and other items)