Alarm monitoring systems; Antennas; Audio-receivers and video-receivers; Batteries, electric; Data processing apparatus; Electric door bells; Electric and electronic video surveillance installations; Electrical and electronic burglar alarms; Identity cards, magnetic; Loudspeakers; Megaphones; Portable media players; Punched card office machines; Radar jamming apparatus; Radios; Semi-conductors; Sound amplifiers; Tape recorders; Telescopes; Time clocks; Time recording apparatus; Transmitters o...