ITEM NAME:5V 2 Channel Relay Board Module for Raspberry Pi ARM AVR DSP PIC TOOL O9O3 M3P1 Color: as shown. Module parameters: 1. Size: 50.6mm (length) * 38.8mm (width) * 19.3mm (height) 2. Weight: 30g 3.PCB color: black 4. There are 4 fixing screw holes around the board, the hole diameter is 3.1mm, which is convenient for installation and fixing. 5. The relay uses high quality relays, single pole and double throw. a common end, a normally open end, and a normally closed end 6. Optocoupler isolation, good anti-interference 7. Low level pull-in, high level release. The status indicator is on when the inverter is closed, and the status indicator is off when released. 8. VCC is the system power supply, and JD_VCC is the relay power supply. The default 5V relay, plug in the jumper cap 9. Maximum output of relay: DC 30V/10A, AC 250V/10A Wiring instructions: VCC: system power supply positive GND: system power supply negative IN1--IN2: Relay control port. Packing: 1pcs2 road with optocoupler relay module..The default 5V relay, plug in the jumper cap. Maximum output of relay: DC 30V/10A, AC 250V/10A. The relay uses high quality relays, single pole and double throw. a common end, a normally open end, and a normally closed end.