To provide the ultimate high-end sound with our T1, we developed the all-metal Tesla system, which ensures transparent, spatial and distortion-free sound. The magnet used in our Tesla driver system is significantly larger than in other headphones and is not located inside the voice coil, but in a ring shape around it. It also has a particularly strong magnetic field (magnetic flux density), which is measured in Tesla units and is well above the one Tesla mark for our headphones with Tesla systems. In addition, our technology enables a more powerful and distortion-free reproduction as well as better detail resolution. Thus, our high-end headphones were able to deliver even better performance on MP3 players than other comparable models at the time. The closed counterpart to the T1, the T5, was added to our high-end range in 2010 and impressed with its high-end sound on portable devices.