[ Electronic lock assemblies; ] radio-frequency controlled locks; access control and alarm monitoring systems, burglar alarms, personal security alarms, fire and smoke alarms, alarm installations, electronic door alarms; environmental monitoring systems comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; radio receivers and monitors for reproduction of sound and signals, multi-function electronic devices for use in remote sound monitoring of a room, temperature monitoring and also for controlling access to a premises; building security systems comprising software and hardware for providing picture, video, alarm status, building plans, and other information to a remote station; telecommunications equipment, namely, [ fiber-optic transceivers, fiber optic repeaters, ] converters and optimizers, [ wave division multiplexers, free-space optics transmission systems, ] switches including ethernet switches and routers, [ fiber-to-the-home and ethernet-over-VDSL access aggregators, ] terminators and repeaters, and remote presence management products, namely, switches and consoles, alarms, sensors and power management devices; electric or electronic sensors for detecting gas, smoke, carbon dioxide and monoxide, liquid level, and motion; electronic proximity sensors; photoelectric sensors; optical sensors; [ day and night vision systems primarily comprising day and night sensors; day and night cameras; ] sensors for the determination of temperatures, positions and distances; infrared detectors, glass break and vibration detectors; interfaces for detectors; occupancy sensors, namely, electronic devices which detect the presence of occupants and control the lighting system accordingly, light systems comprising light sensors and switches; multi-function electronic device comprised of cellular radio modules, application software, power supply, all for use in remote monitoring of electrical equipment; vehicle tracking devices comprised of cellular radio modules, application software, sensors, transmitters, receivers and global positioning satellite receivers, all for use in connection with vehicle tracking, vehicle monitoring and anti-theft vehicle alarms