[ Air analysis apparatus; ] Alarm monitoring systems [ ; Audio-receivers and video-receivers; Baby monitors; Camcorders; Cinematographic cameras; Computers; Electric door bells; Electrical pickups for use with musical instruments; Global positioning system (GPS); LCD monitors for security purposes; Photographic cameras; Portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, data, image, and audio files; Recorded computer ope...