With the / stop function, after the of the module into the loop mode, the relay work in accordance with the set time. It is a timer relay module with high , stable and reliable performance. There is a wide time range you can set, both "RUN" time and "STOP" time are adjustable. Support /stop function, module enter an cycle mode after on, relay works according to the setting run and stop time. It is great to control the reciprocating stroke, or repetitive for equipment and products burn-in test. Widely used on timer operating equipment, machine repetitive test circuit,fish tank intermittent pump, etc. Working : press the button to the cycle, and then press the button to stop working. the Cycle mode : On - Off - On - Off Voltage: AC 100V-250V , can be used for 100V/110V/120V/127V/220V/230V/240V . consumption: Less than 1.0W Output: output, output voltage equals to input voltage. Max. Output Current: Less than 10A Input: Passive switch input, green led lights up after turn on, red led lights up after stop Time Range: 0.5 seconds -1000 minutes Time Accuracy: Max. range value*0.001 (resolution of 1000 ). Input( button): Passive switch input, green led lights up after turn on, red led lights up after stop - starting the input is not necessary.You can the two terminals 2 terminals with a short wire and then the board will cycle infinitely loop ( no buttons)after on. Life: 100 thousand Material: PC+Metal colour: As shown Package Contents: 2 x Dual Time Adjustable Cycle Delay Timing Relay Repeat ON OFF Switch Loop Timer Module Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.