Relay board is one kind of very popular switch module. You can use it control any devices on or off. This is a DC 12V controlled 8 channel relay module. It's high level trigger. Trigger current needs not less than 5mA, it can be used in many industry system that using DC12V power supply.
- 8-Channel Relay interface board, - Each one needs 15-20mA Driver Current - Equiped with high-current relay : DC30V 10A AC250V 10A