BDD Relay Board 4-Channel 3.3V - Optocoupler Isolation, High/Low Trigger

10a 250v 3.3v 30v 5ma BDD RELAY control signal Control Signal Pins Individual channel trigger Low Trigger Low trigger current Maximum Load Capacity optocoupler isolation Power Supply Terminals Relay Relay Board Relay Module operates relay Operating Voltage Relay Output Terminals signal Trigger trigger selection Trigger Selection Jumpers