SunEarth SEProX (RESOL DeltaSol BX) differential temperature control with digital temperature display, programmable functions for solar domestic hot water systems and 26 selectable system layouts. 100-240 Volt operation. Control requires minimum of 2 sensors (5 are included) and will accept up to 5 PT1000 sensors, 1 Grundfos VFS sensor, and 1 Grundfos RPS sensor. There are three semiconductor outputs and one relay output for pumps or valves, as well as one output for VBUS data transfer. Equipped with a factory installed line cord. Special order item, will ship direct from the manufacturer.