Features: * Wireless BT 4.0 ensures transmitting strong signal in high quality and high speed, delivering high-fidelity stereo music. * Built-in microphone enables hands-free calls to set free your hands when doing sports. It also supports multi-point connection technology. * With control buttons, easy to control playing / pausing, adjusting the volume, previous / next songs, answering / rejecting / ending calls. * Ergonomic design guarantees wearing stable and comfortable when exercising, running, climbing and other outdoor sports. * The earbuds can rotate 0-45 degrees to better fit your ear canal, bring you more comfortable experience.