These lightweight, wireless headphones are designed for those who are constantly on the move, with a 40 hour battery life enabling you to experience clear dynamic sound for a whole day on one charge. features, such as built-in controls and a fold flat design, make your listening experience as free and easy as possible. S200BT are lightweight, fold flat, and feature Bluetooth® technology, giving Crystal clear sound - S200BT contain Audio-Technica's tranducer technology for our clear signature sound