Features: It is a timer relay module with high accuracy, stable and reliable performance. There is a wide time range that you can set, both "RUN" time and "STOP" time are adjustable. Support start/stop function, module enter an infinite cycle mode after power on, relay works according to the setting run and stop time. It is great to control the reciprocating stroke, or repetitive power on and off for equipment and products burn-in test. Widely used on timer operating equipment, machine repetitive test circuit,fish tank intermittent pump, etc. Specifications: Voltage: AC100V~250V Power: <1.0W Output: Active output, output voltage equals to input voltage. Maximum Output Current: <10A Input: Passive switch input, green led lights up after turn on, red led lights up after stop Time Range: 0.5sec. to 1000min. Time Accuracy: Maximum range value*0.001 Input(start button): Passive switch input, green led lights up after turn on, red led lights up after stop Start input is not necessary. Connect these 2 terminals and then the board will cycle infinitely after power on. Size: 88 x 38 x 22mm / 3.46 x 1.49 x 0.86" Mounting Hole Spacing: 83 x 33mm / 3.26 x 1.3" Mounting Hole Diameter: 3.2mm / 0.12" Instruction: Time can be set when the board is powered on or powered off. 1, Set Run Time: Adjust the RUN TIME potentiometer clockwise to increase, counterclockwise to decrease. The red switch below can set time range(left, 0-100 or 0-1000) and unit(right, Sec. or Min.) 2. Set Stop Time: Adjust the STOP TIME potentiometer clockwise to increase, counterclockwise to decrease. The red switch below can set time range(left, 0-100 or 0-1000) and unit(right, Sec. or Min.) 3. Start Button(Not included): Connect a momentary push-button switch and press it, then green LED lights up indicating it is working. The board would automatically run according to the setting run time and stop time, infinite cycle.Press the start button again, then red LED lights up indicating it stops. 4. Time Setting Example: Requirement: Run for 20 seconds, stop for 30 minutes, infinite cycle. Settings: (1)Set run time range to 0-100; (2)Set run time unit to Sec.; (3)Set run time potentiometer to 20 position, namely the position of 20/100 from left; (4)Set stop time range to 0-100; (5)Set stop time unit to Min.; (6)Set stop time potentiometer to 30 position, namely the position of 30/100 from left; The position of potentiometer can also be set using the method of measuring voltage. Minimum is 0V, maximum is 5V.20/100 * 5 V = 1.0 V; 30/100 * 5 V = 1.5 V. Note: 1. Use a start button whose current is more than 0.1A 2. Electric Shock Alert, start button wire has high voltage, be careful please! 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package Includes: 1 x Timer Relay Module .