Access control and alarm monitoring systems; [ Audio- and video-receivers; Camcorders; Computer network switches; Electric wires and cables; Electrified fences; Electronic control gears (ECGs) for LED lamps and light fixtures; Infrared detectors; Megaphones; Microphones; Power adapters; Smoke detectors; Sound recording apparatus; Telescopes; Video cassette recorders; ] Video monitors; [ Video multiplexers; ] Video recorders; Webcams [ ; Wireless transmitters and receivers ]