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 on, the relay works according to the runtime and stop time setting. It is perfect to control reciprocating stroke, or repetitive 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. Consumption: less than 1.0W Output: Active output, output voltage equal to input voltage. Max. Output current: less than 10A Input: passive switch input, green led light on after on, red led light on after shutdown Time range: 0.5 seconds to 1000 minutes Time accuracy: maximum range value * 0.001 (resolution 1000). Input (start button): passive switch input, green led light on after on, red led light on after shutdown Starting 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 on. Life: 100 thousand times Size: 88x38x22mm / 3.46x1.49x0.86 inch Mounting hole spacing: 83x33mm / 3.26x1.3 inch Mounting Hole Diameter: 3.2mm / 0.12 inch Colour: green Material: plastic Package Contents: 1 x Dual Time Adjustable Cycle Delay Timing Relay 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 measurement allowed error is +/- 1-3cm.