Other FeaturesWireless design, tangle free, fit & secure, no holding back, 137 mAh lithium battery, 11 hours (≈ 220 songs) continuous playback, Brings balanced wear experience with symmetrical design of inline controller and battery, 5 g / ear lightweight, Shark-fin ear-wings, Integrated ear-tips with ear-wings, Magnetic design for easy portability, stylish design for additional decoration.