The invention relates to a combined method and device for powering and charging, wherein said device comprises an AC motor, a converter, storage means, and switching means either for enabling the powering of the motor or for enabling the charging of the storage means by the converter. The system carrier is designed to accommodate an integrated, adjustable pressure-reducing valve. When thus depressed, the cleaning product is extruded through holes in the head into the region of the bases of bristles on the front side of the brush. The fixture is located within the inner compartment and includes an elongated display member and a bracket. A WiFi Direct Link may be paired with a Push to Talk over Cellular link in order to couple together more than two devices. The total current conducted by the DUT may be equivalent to a sum of the respective currents flowing in the two current branches.