AUKEY EP-B4 Bluetooth Headphones, Wireless Sport Earbuds with Built-in Remote and Microphone for iPhone, Android Smartphones Sweat-proof, light weight and ergonomic design to enhance your comfort; comes with interchangeable earbuds and ear hooks for secure and personal fit when walking or exercising Latest Wireless Bluetooth 4.1 Technology with A2DP stereo music and Apt pure, clear sound, ideal for high quality music while running, jogging, cycling, skating, etc. Good noise isolation to create the optimal environment for listening to your favorite tunes, built-in microphone with noise cancellation for clear calling and friends chatting Built-in rechargeable lithium battery lasts up to 4.5 hours of Talk/ play time or 175 hours standby, Universally compatible with most Bluetooth-enabled phones. Works with iPhone, iPad, Android and Windows smartphones tablets and other Bluetooth devices