1.You can use the timer to SWITCH ON/OFF any electrical equipments at a preset timer 2.16 ON/OFF programs per day, 15 combinations to a week. 24 hours / a week programmable. 3. Built-in battery for backup the memory (save the programs you set)when power failure 4. Auto time error correction +/- 30 sec, weekly 5. Repeat programs with 16 on/off settings, and setting on/off manually, Easy to read LCD display, LED indicators. MULTIPURPOSE PROGRMMALBE TIMER SWITCH HAS FIVE FUNCTIONS: 1. CLOCK DISPLAY 2. TIMER 3. COUNTDOWN 4. AUTO TIME DEFLECTION CORRECTION, WEEKLY 5. SLEEP MODE Usage: The TM618 timer MODULE (1.598INCH big LCD display) can open or close kinds of electrical apparatus and power automatically, according to the preset time, the items can be streetlight, neon light (sign), , electrical appliances, broadcast equipments etc., the digital timer switch is within rechargeable battery, in 1.2V/40Ma, high-accuracy CMOS chip, strongly anti-jamming, easy to use. size:7.0 cm x 7.0 cm x 4.0 cm Material:ABS+electronic components colour:white Package Contents: 3 x TM618N-4 switch 3 x User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.