Amplifiers; Batteries; Amplifier stands; Audio amplifiers; Audio cables; Audio speaker enclosures; Bass amplifiers; Bass speakers; Batteries and battery chargers; Carrying cases, holders, protective cases and stands featuring power supply connectors, adaptors, speakers and battery charging devices, specially adapted for use with handheld digital electronic devices, namely, cell phones, MP3 players, and personal digital assistants; Cases for music, audio and related electronic equipment, namel...