TecBillion Bluetooth Headphones V4.1 Wireless Sport Stereo In-Ear Headset Sweatproof for Gym Hiking Exercise, with Microphone for Android Smart Cellphones, Blue & Black High-Fidelity Sound : With Advanced bluetooth v4.1 and APTX tech, the headphones ensure high-fidelity stereo music and clear speech within 33ft(Open Space). Easy and fast syncing to your favorite wireless devices bluetooth enabled devices, like iPad, iPhone, iPod Touch, Android Smartphones and etc Confortable and Secure Fits: Lightweight design and in-ear soft earhooks ensure a comfortable and secure fit for most people during gym, jogging, hiking, cycling, and other normal sports. Premium soft smooth silicone gel surface helps sweat proof Noise Cancellation: Reduces background noises, enable clearer sound from microphone, you will get a high quality, hands-free phone conversation or music enjoy even on the street or inside shopping mall. (Volume and Quality would be affect by the device itself) Intelligent System: Intelligent text reading function enable you know everying message in time, then respond them with built-in mic in a simple way. Take hands-free calls with built-in mic. This bluetooth headset provide an impressive 5 hours playtime on a single charge(Playtime varies according to volume level and audio content) Quality Warranty: TecBillion take care of all quality problem within 1 year, any problems please contact us without hesitate!! Before buying, please read the description well!