COULAX Bluetooth Headphones Wireless Over-Ear Headphones Sweatproof Running Earbuds with Noise Cancelling Mic Stereo Headset (Bluetooth 4.1, Secure Ear Hooks Design, 8 Hours Play Time) NATURALLY BALANCED SOUND: advanced APTX and CVC6.0 noise cancellation offer the realistic human and bass sound, enjoy the best music without any interference from the outer world. STABLE AND COMFORTABLE FIT: Streamline design guarantees stable and comfortable wearing experience, high end polished metal case headphones looks exquisite and compact. ULTRA LONG STANDBY: with powerful & fast recharging battery, it can deliver up to 8 hours of play time with a single charge or 110 hours of standby time. BLUETOOTH 4.1 CONNECTION: Outstanding connection range up to 33ft for seamless syncing to your favorite wireless devices. Built in Mic functionality that you can talk with headphone. PAIR WITH 2 DEVICE: The Bluetooth earbuds pair with 2 different bluetooth devices simultaneously,That you can use two cell phones without having to switch headsets every time.