HiLetgo 12V 8 Channel Relay Module With Optocoupler High And Low Level Trigger The product is registered Trademark by GERI? . Using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA; The module Operating voltage 12V; The module can be high or low by a jumper setting trigger; Fault-tolerant design, even if the control line is broken, the relay will not operate; The power indicator (green), the relay status indicator (red).