It is a timer relay module with high precision, stable and reliable performance.There is a wide range of time you can set, run time and stop time are adjustable.Support start / stop function, the module goes into infinite cycle mode after power on, the relay works according to the runtime and stop time setting.It is perfect to control reciprocating stroke, or repetitive power on and off for equipment and break-in test products.Widely used on timer operation equipment, machine repetitive test circuit, fish tank intermittent pump, etc.With start / stop function, after starting the module in the infinite loop mode, the relay works according to the set time.Working model:Press the start button to start the cycle, then press the start button to stop working.Start Cycle mode: on-off-on-off-Voltage: AC 100V-250V, can be used for 100V / 110V / 120V / 127V / 220V / 230V / 240V / V / V.Power Consumption: less than 1.0WOutput: Active output, output voltage equal to input voltage.Max. Output current: less than 10AInput: passive switch input, green led light on after power on, red led light on after shutdownTime range: 0.5 seconds to 1000 minutesTime accuracy: maximum range value * 0.001 (resolution 1000).Input (start button): passive switch input, green led light on after power on, red led light on after shutdownStarting the input is not necessary. You can connect the two 2 terminal terminals with a short wire and then the board will cycle continuously in a loop (no buttons) after power on.Life: 100 thousand timesSize: 88x38x22mm / 3.46x1.49x0.86 inchMounting hole spacing: 83x33mm / 3.26x1.3 inchMounting Hole Diameter: 3.2mm / 0.12 inchColour: greenMaterial: plasticPackage Contents:1 x Dual Time Adjustable Cycle Delay Timing RelayOnly 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 measurement allowed error is +/- 1-3cm.