Microphones; Audio-receivers and video-receivers; Audio-video receivers; Audio amplifiers; Audio speakers; Audio- and video-receivers; Audiovisual receivers; Cell phone mounts for vehicles; Electronic interconnecters for audio and video signals; Karaoke players; Mobile phone chargers; MP3 players; Portable electronic recorder for measuring and recording multiple voltage, current and thermocouple readings from various transducers; Portable listening devices, namely, MP3 players; Stereo amplifi...