Features: [Bluetooth Connection] Bluetooth 4.1 technology ensures super-fast data transmission and stable performance. Compatible with almost all Bluetooth-enabled devices such as, for iPhone X 8S smart phones, Tablet PC and more. [Lightweight Ergonomic Design] 26g only makes you forget the weight of the headset while running and only remember surging rhythms. Elastic memory fitting line design ensures stable wearing, no need to worry about the headphone falling off. [Stereo Sound Effect] With double audio frequency engine, double frequency multi-point superposition and stereo surrounding, the headphones brings perfect sound effect and makes you feel like at the site a concert. [Built-in Mic and Buttons] It supports hands-free function with high-grade microphone, thoroughly setting free your hands from answering the call during exercise. Equipped with three buttons control, easy to control music and calls. [Sweat-proof design] The low-pressure plasma nanotechnology is adopted to prevent the outside water molecules from encroaching into the inner circiut. The waterproof standard can reach IP34. [Long Battery Life] Rechargeable lithium polymer battery allows continuous enjoyment of music for up to 7 hours playtime with a quick charge of only 1.5 hours, and standby time is about 7 days.