Audio frequency amplifiers; Portable power chargers; Holders adapted for smartphones; Portable vibration speakers; Stands adapted for mobile phones; Stands adapted for tablet computers; Wireless speakers; Racks for loudspeakers; Electric audio playback units with lights and speakers; 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,...