A control circuit board is opposed to an outer surface of a case in the form of a rectangular box, and an connector cable, which has connector terminals connectable with an external device, extends from the circuit board. The control circuit board has a plurality of first connector pads with a first property and a plurality of second connector pads with a second property different from the first property, the first and second connector pads being arranged side by side on the control circuit board. The connector cable has a proximal end portion connected to at least one type, among the first and second connector pads, and the connector terminals including a plurality of connector terminals connecting with the at least one type of connector pads to which the proximal end portion is connected.