Acoustic sound alarms; Apparatus for transmitting and reproducing sound or images; Apparatus for recording, transmitting and reproducing sound and images; Audio- and video-receivers; Audio-video receivers; Baby monitors; Camcorders; Computers; Electric door bells; Fire alarms; Global positioning system (GPS) apparatus; Smoke detectors; Sound alarms; Sound recording apparatus; Sound transmitting apparatus; Sound and picture recording apparatus; Walkie-talkies; Fire and smoke detectors; Persona...