Features: Wireless BT 4.1 Quick Pairing. Headset with BT V4.1 version, compatible with most BT enabled devices, simple, quick and safe pairing. Ergonomical Comfortable TO Wear Ergonomical design, sporty idea injected, light in weight, rubber coating, comfortable to wear for a long time. Noise-Cancelling Crystal High Quality Sound In-ear headset, clear crystal HD sound, take phone calls with built-in microphone, convenient volume control. Hands-Free Mutifuctional Keys Easy multi-function button, convenient keys, pair/off/on Receive/Hang Music Play/Pause Volume +/-. Conquer ALL Situations Safe Driving Stable for sport activity, watching movies. Sweatproof, nice for sports like running, jogging and gym exercise. Perfect performance in the office or outside, especially for safty when driving in a car. Long Time Standby Endurance Rechargeable Li-ion battery, long time standby, theoretically approx. 3 hour battery life on full charge.