1. You can use the timer to TURN ON/OFF any electrical equipment at a preset timer. 2. 16 ON/OFF programs per day, 15 combinations per week. 24 hours / 7 days a week programmable. 3. Built-in battery to back up the memory (save the programs you set) in case of power failure. 4. Automatic time error correction +/- 30 sec, each week. 5. Repeat programs with 16 on/off settings and set on/off manually, easy-to-read LCD display, LED indicators. MULTIFUNCTIONAL 7 PROGRAMMABLE TIMER SWITCH HAS FIVE FUNCTIONS: 1. CLOCK DISPLAY 2. TIMER 3. COUNTDOWN 4. AUTOMATIC TIME DEVIATION CORRECTION, WEEKLY 5. SLEEP MODE Usage: TM618 timer MODULE (1.598 inch large LCD display) can open or close types of electrical apparatus and power automatically, according to the preset time, the items can be street light, light (sign), electrical appliances, broadcast equipment, etc., the digital timer switch is within rechargeable battery, in 1.2V/40Ma, high precision 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, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.