InzhiRui Best Wireless Sport Running Workout Earbud Sweat Proof Bluetooth Headphone, Cordless on Ear Neckband Headset for iphone ipod Android Samsung Galaxy S7 (Black Grey) InzhiRui X21 Sport Bluetooth headphones has feature Bluetooth 4.1 + EDR APT-X audio decode technology that giving these wireless earbuds unparalleled stereo sound quality and CVC 6.0 Digital noise reduction technology, intelligently filter ambient noise, enable clearer sound during calls or while listening to music. Ergonomic Design earphone comfortable and super fit, Ultra light weight does not cause any burden to the ear, thus providing lasting wearing comfort . The Bluetooth headphones wireless device has the 150mAh polymer battery to provides 6 hours of talk & playing time & 160 hours of standby time. Much more than other sports headphones! you can longer listening with our Bluetooth headset, running & workouts can go for longer to the beat! The bluetooth headphones can pair with any 2 bluetooth devices at a time and compatible with most of Bluetooth devices. For example, iPhone 6, Android phones & tablets and other Bluetooth devices! This gives you double the possibilities for answering calls and streaming music to your workout headphones, all while enjoying premium Bluetooth earbuds wireless sound quality. Extend Range up to 33 FT/10m so you can roam around office or home while on the phone. The running headphones are even sweatproof, so you won't have to worry about wearing them when you're giving a strenuous workout your all.