Audio-receivers and video-receivers; Baby monitors; Camcorders; Converters, electric; Electric door bells; Electric locks; Electrified fences; Light emitting diodes (LEDs); Lightning arresters; Microphones; Optical breadboards; Optical cables; Optical character recognition (OCR) apparatus; Optical glasses; Optical lanterns; Optical lenses; Optical readers; Optical reflectors; Optical scanners; Optical shutters; Optical tables; Ozonisers; Photographic cameras; Solar panels for the production o...