The module uses genuine quality relay, normally open interfaces , Maximum load: AC 250V or 10A, DC 30V or 10A. Using SMD optocoupler isolation, strong driving capability, stable performance trigger current 5mA. Fault-tolerant design, even if the control line is broken, the relay will not move. The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient. The Module can be set by jumper high or low trigger. Module description: 1.The module Operating voltage 5V 2.Fault-tolerant design, even if the control line is broken, the relay will not operate 3.The power indicator (green), the relay status indicator (red) 4.Module size: 50mmx26mmx18.5mm (LxWxH). Interface: -Input VCC: Relay power supply and GND: Relay power supply - IN: Signal trigger input (High or Low Level Signal, select via jumper) -Output NO: Relay normally open. COM: Relay Common Pin NC: Relay normally closed. High or Low Level Trigger Select: 1. Use High Level Trigger When IN input High Level Signal, the NO connect with COM When IN input Low Level Signal, the NC connect with COM 2. Use Low Level Trigger When IN input Low Level Signal, the NO connect with COM When IN input High Level Signal, the NC connect with COM 3. High or Low Level Trigger Select Jumper connect with L, Low Level Trigger Jumper connect with H, High Level Trigger Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store