COULAX Bluetooth Headphones V4.1 Neckband Wireless Stereo Sports Headphones Noise Cancelling Headset Earbuds Sweatproof for Running with Mic for iPhone 6S 6S Plus Samsung Android Smartphones Behind-ear Ergonomics Design: lightweight & neck-strap designed comfortable to your ear. Guarantee 100% stable wearing while Exercise, Running, Climbing, Riding, Skating, Camping, Fishing or other sports Perfect Rotating & Adjustable: the unique rotating earbuds can adjustable the angle fit in ears. These Headsets hardly cause foreign body sensation when wearing and doing sports and other high intensity activities. Simple One-button operation: a single button with multi-function controls answer/hang up calls and play/stop/track music. You need not touch your phone and enjoy real freedom by wireless connection. Amazing Hi-Fi Sound Quality: CVC6.0 noise cancellation tech intelligently filters ambient noise, perfectly transfer HD music. Enable clearer sound during calls and while listening to music; You've truly never heard music sound so good from sport headphones. PAIR WITH ANY 2 DEVICES: Bluetooth headphones can pair with 2 different Bluetooth devices simultaneously, like iPhone iPad Android and other Bluetooth devices. Double the possibilities for answering calls and enjoying music to your workout headphones