Enjoy superb balanced sound and supreme comfort. Large 50 millimeter speaker unit drivers combined with neodymium magnets provides stereo sound, powerful bass, clear vocal, and crisp high tones form perfect balanced sound. A built-in 1500mAh battery provides up to 80 hrs play time in a single charge. Wired mode: can also used as a wired headphone thanks to a provided audio cable with a mic which can make clear talk or sing with.