The SeaDAC Lite - USB to 4 Isolated Inputs; 4 Form C Relays offers 4 optically isolated inputs and 4 Form C (SPDT) relay outputs, allowing easy control and monitoring of equipment via USB connection. The inputs are 5-30VDC with 3500VDC isolation, and the high-current Form C relays can switch up to 6A at 250VAC and 5A at 60VDC..