Sports Bluetooth Headset Wireless Stereo Bluetooth Earpiece Earphones Music Headphone Built-in Microphone Mp3 Fm Player Compatible with Android Ios Cellphones Smart Phones Driving Running Hiking Blue Light Weight, Comfortable for Sports: This bluetooth headset designs with small mini size and provide a perfect seal and snug fit. You won't feel the presence of headphones during exercise. HD Sound, Noise Cancelling: Bluetooth earpiece built in high quality microphone, let you feel that you are talking face to face during a call. Automatically Shrinks, not tie knots: Bluetooth headphone has flexible design, no winding. when you don't use headset, it will shrink to small size automatically. Easy to carry in everywhere. Support TF Card: Bluetooth headset with TF slot, after you insert your tf card, you can leave your phone at home and enjoy your running and freedom. (not included card.) Sweatprood Earphones: Sweatproof Nano-coating efficiently protects sport headphones from sweat and ensure more guaranteed life span, perfect for running, jogging, hiking, yoga, exercises, gym, fitness, travelling and etc.