Headphones; Cameras; Microphones; Headphone amplifiers; Microphone cables; Wireless headsets for smartphones; Loudspeakers; Stereo headphones; Telephone receivers; In-ear headphones; Wireless headsets for tablet computers; Music headphones; Telephone earpieces; Earpieces for remote communication; Batteries for use in hearing aids; Lithium batteries; Electric plugs; Magnetic object detectors; Electromagnetic measuring detectors; Radiation detectors; Smartglasses; Global Positioning System (GPS...