2-way relay module with opto

 Module Parameters:  1 Dimensions: 50.5mm (length) * 38.5mm (W) * 18.5 (H)  2 Weight:. 31g  3.PCB Color: Black  4 board four weeks with four screws holes, hole diameter 3.1mm, easy to install and fixed  5 relay of high quality loose music relays SPDT. A common terminal, a normally open, one normally closed terminal  6 optocoupler isolation, good anti-jamming   7 low pull, high release. Energisation status indicator light, release status LED is off  8.VCC of system power, JD_VCC relay power. You can plug in jumpers  Electrical parameters: Supply voltage: 5VDC, 12VDC Current: more than 100mA Load: 250V 10A AC or 30V 10A DC    Wiring: VCC: positive power supply system  GND: System power negative  IN1 - IN2: relay control ports