Harmonics 222 Amazing bass, latest Bluetooth and Smart in-line controls with a high delity microphone, enables convenient remote controlled music and phone calls. High Capacity built-in lithium batteries support up to 7-8 hours talk / music time with battery indicator on iOS and Android. Symmetrical balance and Ergonomics design ensure a secure comfortable t. This headset has IPX5 rating and can withstand sweat, splashes and wet weather conditions, enhancing the headphone's using life. Using magnetic latch, secure it around your neck when not in use. : Compatible with almost all smartphones and other devices, including iOS, Android device, MP3 and MP4 music players, etc.