Protective cases for portable electronic devices, namely, tablet computers, laptop computers, smart phones and digital media players; protective cases for portable electronic devices, namely, tablet computers, laptop computers and smart phones, which are specially adapted to hold card readers for credit cards; polycarbonate protective case for an electronic device for recording, storing and transmitting audio files; fitted plastic films known as skins for covering and providing a scratch proof barrier or protection for electronic devices, namely, tablet computers, laptop computers and smartphones; earphones, ear buds and headsets; earphones and lanyard combinations, sold as a unit, for use with handheld electronic devices; an electronic docking station for charging and storing multiple tablet computers, personal digital media players, and smart phones; combination automobile charger and docking cradle for an electronic device for recording, storing and transmitting audio or video files; electric converters and electrical connectors; electrical cables; electric power supplies; audio and video adapters; radio receivers; remote controls for toys and audio devices, namely, digital music players and smart phones; holders, mounts, stands and desk stands for use with portable audio devices, digital music players, smartphones, tablet computers and personal computers; chargers and wireless FM transmitters for use with portable computers and instructional software sold therewith; a wireless sound system for use with a digital music player comprising a charging base and speakers; microphones and audio speakers; audio processing accessories for computers, namely, adapters, limiters and compressors; radio transmitter that is connectable to a computer or a digital media player; specialty holsters adapted for carrying personal electronic devices, namely, smart phones; armbands specially adapted for personal electronic devices, namely, smartphones and portable media players; electronic hardware for attachment to portable electronic devices to convert them to point-of-sale terminals, barcode scanners and magnetic strip readers; mobile application software for portable computing devices, namely, smart phones and tablet computers; devices for the recording, processing and reproduction of sound and music; digital interfaces for use with portable electronic devices, namely, personal computers, tablet computers and smartphones for audio recording; USB audio interfaces; detachable mounting apparatus for attaching a smartphone to a headstock of a stringed musical instrument