Features: Sound: The High-fidelity stereo sound benefits from the 40mm powerful driver and the around-ear cushion design which provide a well-closed and immersed enviroment for your ears, Just lose yourself in the music! and Wired:a. The wireless mode: Battery update to 20 hour music time/talking time in a single charge. b. The Wired mode: you can also use it as a wired headphone with the provided audio cable. Foldable Design: The foldable Headband is not only designed for saving your desk space but for carrying in the provided bag.