StopWatt Electricity-Saving Box is a small plug-in device marketed as a power-conditioning and electricity-saving solution. The device is designed to plug into a standard electrical outlet and is promoted as a way to stabilize electrical flow, reduce power waste, and help protect household electronics from voltage fluctuations.
According to its current product information, the device is intended to help stabilize electrical flow and reduce fluctuations within a home's electrical system. The manufacturer-facing descriptions also discuss filtering electrical noise and supporting more consistent power usage.