Electric door bells; portable media players; slide projectors; smart watches; video baby monitors; video recorders; wearable activity trackers; closed circuit TV systems for security and surveillance, namely, cameras, switchers, monitors, microphones, and recorders; baby monitors; battery monitors; camcorders; cameras; digital audio and video recorders and players; audio mixers; audio amplifiers; audio dubbing apparatus; audio- and video-receivers; electric audio playback units with lights an...