The lightweight DT 1 single-sided earphone can be used with a tour guide system (cable length 0.9 m) or other mobile devices. The neodymium magnet system used for the earphone ensures excellent sound properties and intelligibility of speech. The ergonomic earphone with elastic ear piece is suitable for different ear sizes. As the cable runs in the middle, the earphone can be worn on the left or right ear. The matt non-glare surface avoids disturbing light reflections. After each tour the earphon