Sony MDR-RF4000K Wireless Headphones were first released on 11th February 2010. The elegant black design with a weight of 300.50g makes the Sony MDR-RF4000K Wireless Headphones a beautiful and comfortable pair of headphones. Its battery life is 8hrs, helping you comfortably use it throughout a long active day. Sony MDR-RF4000K Wireless Headphones is also foldable so you can put it conveniently in your bag.
