WOFALA Bluetooth Headset-Bluetooth Stereo Headset Wireless Bluetooth Sport Running Headsets for Smartphone-Green Bluetooth V4.0, Compatible with all standard Bluetooth-enabled mobile phone, media devices. Pure Sound In-ear white noise and listener fatigue reduction. Eliminates the white noise and delivers a clean audio experience offering hours of pure enjoyment. High-fidelity stereo music and clear speech, You can begin enjoying CD quality stereo sound instantly. Strong Wireless Signal: you can enjoy skip-free music in a 10-meter working distance, even if use your music devices left/right side, above/below wais Universally compatible with most Bluetooth-enabled phones.And built-in extra-long battery allows up to 4-hour talking/playing time