GRDE HBS950  Retractable Earbuds Neckband Bluetooth Headphones Black Retractable wire management: Easy to shrank the length of the line by only pressing a button and neckband wearing style, keeps your hands-free Bluetooth 4.0 & apt-X Headphones : 10 meters bluetooth range, noise reduction, echo canceling, perfect for enjoying music when doing sports Rechargeable built-in battery and microphone: Up to 550 hours standby time , up to 14 hours for music, up to 17 hours for talking Vibration alert on power and coming calls functions: Please press (call button) to answer the phone ;Please shortly press (call button) to reject the phone Easy to operate: With individual ON/OFF button, Answer/Hang Up/Reject the call button, Pause and Play button, you can play, skip and pause music, control volume and pick up calls