Alarm monitoring systems; Audio- and video-receivers; Batteries, electric; Burglar alarms; Chargers for electric batteries; Optical character recognition (OCR) apparatus; Personal stereos; Solar batteries; Sound transmitting apparatus; Transmitters of electronic signals; USB cables; Electrical plugs and sockets; Electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; Level gauges; Micrometer gauges; Traffic-light apparatus