Bluetooth Headphones,Aumy V4.1 In-Ear Wireless Stereo Noise Cancelling Headsets with Microphone,Sport Earhook Sweatproof Earphones Running Gym Work out Earbuds [ERGONOMICS DESIGE]Each ear piece has a rubber coated wire that fits over your ear and you can bend them to firmly hold the earbuds onto your ears while you exercise or work.This headphones is CSR Bluetooth Chip,So Maybe sometimes you can't connect your device successfuly.But don't worry ,If it happens ,Please turn off your device and connect bluetooth again ,Please comfire your device prompt"connect successfully" before you Switching your Phone. [WATER-RESISTANT]These headphones are sweat and weather proof because they're designed to withstand anything Mother Nature throws at them ,This means you don't have to worry about sweat-in case you're running or at GYM [NOISE CHANCELLING]It do a great job of blocking out noise,While in-ear headphones deliver stunning bass [WIRELESS DESIGN]Wireless Bluetooth gives you the ability to connect up to 30 feet to your Bluetooth enabled device -allowing you to move freely and stay focused on your workout. [4.1 BLUETOOTH TECH]Bluetooth 4.1 gives you total freedom with advanced Pure Sound and SignalPlus technology delivering incredible audio performance