You can use the timer to switch on/off any electrical equipment at a preset time. 16 on/off programs per day, 15 combinations per week. 24 hours a day, 7 days a week programmable. Built-in battery for memory backup (saves the programs you set) during power failure. Auto time error correction +/- 30 seconds weekly. Repeat programs with 16 on/off settings, and manual on/off setting. Easy to read LCD display, LED indicators. Multipurpose 7 programmable timer switch has five functions: clock display, timer, countdown, auto time deflection correction weekly, sleep mode. Usage: The TM618 timer module (1.598 inch large LCD display) can open or close various electrical devices and power automatically according to preset times. Items can include streetlights, lights (signs), electrical appliances, broadcast equipment, etc. The digital timer switch contains a rechargeable battery, 1.2V/40mA, high-accuracy CMOS chip, 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 content is included, other products are not included. Note: Lighting and different displays may cause slight color differences between the item in the picture and the actual product. Measurement allows an error of +/- 1-3 cm.