Latest Bluetooth 4.1 & CVC 6.0 Technology : Easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices; Noise Isolation technology reduces outside noises, Built with HD Microphone, Enable clearer microphone sound, Hands-Free music and conversation control allow you pleasant enjoyment during exercising. Super light weight : It is only 15g. They are comfortble fit even after longtime. The headphones ensure comfortable and secure wearing and using experience. We hope you can wearing earhook whe you are running . We are offer free earhook in the package. IPX4 Waterproof technology: They are sweatproof headphones that will still keep stay in place during sweaty workouts. Even if you sweat when you exercise, headphones can work properly.