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, weekly. 5. Repeat programs with 16 on/off settings and set on/off manually, easy-to-read LCD display, LED indicators. MULTIFUNCTIONAL 7 DAY PROGRAMMABLE TIMER SWITCH HAS FIVE FUNCTIONS: 1. CLOCK DISPLAY 2. TIMER 3. COUNTDOWN 4. AUTOMATIC TIME DEVIATION CORRECTION, WEEKLY 5. SLEEP MODE Usage: The TM618 timer MODULE (1.598 INCH large LCD display) can automatically open or close various types of electrical equipment, according to the preset time, the items can be street lights, neon lights (sign), electrical appliances, broadcasting equipment, etc., the digital timer switch is with 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 a little different from the real thing. The allowed measurement error is +/- 1-3 cm.