5V 4 Channel Relay Module High/low level trigger with Optocoupler

Function and Features: Max Load: 250VAC 10A/ 30VDC 10A SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA Each channel module can be set high or low-level triggered by jumper Power indicator (green), 4 Relay status indicator (red) Board size: 73mm x 50mm x 18.5mm When com with low short circuit, triggering the corresponding relay is low, and high when com shorted