- 1-Channel Relay interface board, - Each one needs 15-20mA Driver Current - Equipped with high-current relay : DC30V 10A AC250V 10A - LED indicator status - VCC: Connected 5V - GND: Grounding - IN: Control terminal, high level relay pull, low level relay release, driver current need to over 4mA (Low trigger only) - COM: Control loop grounding - GND: Grounding