5v 4 channel relay with optocouplerThis is a 4 Channel Relay Module 30A with Optocoupler Isolation 5V Supports High and Low Triger. Using a high-power relay, the maximum control load is DC 30V 30A / AC 250V 30A. With each optocoupler isolation, anti-interference ability. In line with international safety standards, the control area and the load area with isolation slot. Each channel has a relay on LED indication