Custom One Pro is just the beginning of a complete new product family from beyerdynamic "Custom Series". The first truly customizable and interactive headphone in the world. The end user can change the sound, the style and the application any time after the purchase. Custom One Pro is the first model in the series for 2012. Designed and crafted in Germany by beyerdynamic for Pro Users, Consumers and Prosumers. Use with portable and professional devices. One headphone many applications. Change the sound, the style and the look. The CUSTOM series is one-of-a-kind, as it allows you to redesign and re-engineer your headphones at any time, making them the perfect match for whatever the situation or your mood demands. This is truly a product for the new headphone 2.0 generation.