Aerials; Battery chargers; Burglar alarms; Devices for wireless radio transmission; Dynamometers; Earphones and headphones; Electric batteries; Frequency meters; Loud speakers; Masts for wireless aerials; Microphones; Remote video monitoring system consisting primarily of a camera and video monitor for recording and transmitting images to a remote location; Short range radios; Solar panels for the production of electricity; Walkie-talkies