Direct current converters; Rechargeable batteries; Power controllers; Amplifiers; Power adapters; Battery packs; Wireless speakers; Radios; Portable power chargers; Batteries and battery chargers; Low-voltage power supplies; Rechargeable electric batteries; Consumer electronic products, namely, audio amplifiers, audio speakers, audio receivers, electrical audio and speaker cables and connectors, audio decoders, video decoders, speakers, power conversion devices, power converters, and power in...