Product Introduction; --------------------------------------- 1.Driving Port Signal Voltage:3.6-24V 2.Output Port Voltage Port:3.6-30V 3.Jumper Cap Can Achieve Output Port Is High POtential Or Pull Down Output 4.Onboard 4-Channel 817 Are Independent:can achieve different voltage control at then same time NOTE: The input port is shared with GND; The output ports are independent of each other. Optocoupler related items : https://www.tokopedia.com/lisuinstrument?keyword=optocoupler