Description: Dimensions: 50.6mm (length) * 38.8mm (W) * 19.3mm (height) Weight: 30g PCB color: black Board four weeks with four screw holes, hole diameter 3.1mm, easy to install and fixed Relay selection of quality loose music relays, SPDT. A common terminal, a normally open, one normally closed terminal Optocoupler isolation, good anti-jamming Low pull, high release. Energisation status indicator light, release status LED is off VCC is the system power, JD_VCC for the relay power. Default hair 5V relay, plug the jumper cap to Relay Maximum Output: DC 30V/10A, AC 250V/10A Wiring: System power supply positive GND: System power supply negative IN1 - IN2: relay control ports Relay contact capacity 250V10A. Relay output normally open, normally closed;Active low. 5V relay signal input voltage range :0-5V; VCC system power. JD-VCC supply to the relay. Default 5V relay. JD-VCC and VCC can be shorted