["Feature:\r\nPower indicator (green),relay status indicator (red)\r\nSMD optocoupler,driving ability,stable performance; trigger current 5mA\r\nFault-tolerant design,even if the control line is broken,the relay will not move\r\nInterface design is user-friendly,all interfaces can be directly connected by wiring terminals,very convenient\r\n\r\nSpecifications:\r\nDC+:Connect to Positive Power Supply (3.3V)\r\nDC-:Connect to negative pole of power\r\nIN:Low level control relay pulls in\r\nRelay output:\r\nNO:The relay is normally open interface, before the relay is closed,it is left unconnected.After picking up,it is shorted to COM.\r\nCOM:Relay Common Interface\r\nNC: Relay normally closed interface,short circuit with COM before pull-in relay\r\nSize:5.6x1.2cm/2.2x0.47inch\r\nNote:\r\nPlease allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid\r\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage Includes:\r\n1x 1 Channel Relay"]