The device helps you when you have two loads and only one power switch. For example, you have a combined deck/steaming light on the mast and only two wires (positive and negative) inside the mast. Smart Relay powers the first channel when you turn the power switch on, and it powers the second channel when you cycle the power switch twice in one second. Contains a bi-stable relay and uses power only when channels are switching; at all other times it consumes less than 0.5 mA.