1、This time delay relay can be powered with low voltage, minimum to 3V. 2、Commonly-used 3.7V lithium batteries, 5V power banks, switching power supply can be used to power this board. 3、Widely used to control motors, light bulbs, LED belts, DC motor, small pumps, etc. 4、Output optical coupling isolation improves anti-interference ability. 5、The module uses industrial level circuit board, and set parameters will be saved after power failure. Features: Commonly-used 3.7V lithium batteries, 5V power banks, switching power supply can be used to power this board. Widely used to control motors, light bulbs, LED belts, DC motor, small pumps, etc. Output optical coupling isolation improves anti-interference ability. The module uses industrial level circuit board, and set parameters will be saved after power failure. Specification: Working current: DC 3V~7V 3.8V~7V Signal source: DC 3V~12V (commonly use power supply positive trigger, button, PNP sensor, PLC signals, etc.) Output capacity: Can control equipment within DC 30V3A or AC 220V3A Quiescent current: 15mA  Working current: 30mA Service life: >100,000 times Operating temperature: -40℃~85℃ Size: 64.2*34.8*15mm / 2.5*1.4*0.6in Weight: 22g / 0.8oz (approx.) Package list: 1 * Module Function: Delay time range:Minimum 0.1 seconds, maximum 999 minutes, adjustable. P-1: Signal trigger relay is energized, and when time is over, relay is de-energized; during the period of delay: A: Trigger again is invalid B:Trigger again can start a new timing  C:Trigger again will cause relay to reset and end timing P-2: Signal trigger starts timing for T1, when time is over, relay is energized for T2 then de-energized (reset) P-3: Cycle:Energized for T1, de-energized for T2, infinite cycle.Time of T1 and T2 are both adjustable. A: After powered on, relay is first energized then de-energized for a infinite cycle  B:After powered on, relay is first de-energized then energized for a infinite cycle P-4: When there is signal, relay is energized; when signal disappears, it start timing, and relay is de-energized when time is over. During the period of delay, if signal appears again, it cancels delay; and when signal disappears, it start timing again. Mode selection: After powered on, press and hold K1 button for 2 seconds, then press K1 to enter select mode P1~4, K2 enter the model. P-1: Signal trigger relay is energized, and when time is over, relay is de-energized; during the period of delay: A: Trigger is invalid  B:Trigger again can start a new timing  C:Trigger again will cause relay to reset and end timing P-2: Signal trigger starts timing for T1, when time is over, relay is energized for T2 then de-energized (reset) P-3: Cycle: Energized for T1, de-energized for T2, infinite cycle.Time of T1 and T2 are both adjustable. A: After powered on, relay is first energized then de-energized for a infinite cycle  B:After powered on, relay is first de-energized then energized for a infinite cycle P-4:When there is signal, relay is energized; when signal disappears, it start timing, and relay is de-energized when time is over. During the period of delay, if signal appears again, it cancels delay; and when signal disappears, it start timing again. After selection of work mode, press K1 to enter subtle adjustment setting of function, namely switch among A, B, C. Setting time instructions: K2: The shift button:Press to adjust the flashing position of the display, K3 will adjust whichever flashes.Until press K2, display stops flashing. K3:When display flashes, K3 adjust digits, 0 to 9 in turns. When display does not flash, K3 adjust decimal point position: the decimal point in the units position indicates 0 to 999 minutes;in the "tens" position indicates 0 to 99.9 seconds;no decimal point indicates 0 to 999 seconds. Note:Function P-2 and P-3 have two groups of time that need adjustment; press K2 for six times is a cycle, first three times adjust a time, last three times adjust another time.(blue light on indicates setting the relay energized time, blue light off indicates setting the relay de-energized time.)