Bluetooth V4.1 Headsets, Sport Wireless Headphone Earbuds Microphone Stereo Headsets with Ergonomic Designed Ear Hooks Sweatproof COMFORTABLE & SECURE FIT: With Ergonomic design and silicone ear hooks, Mufu Bluetooth Headphones are secure behind your ears and rest comfortably in the ear canal. No worry of dropping during Running, Cycling, and impact Sports. HIGH-FIDELITY CLEAR SOUND: The Bluetooth 4.1 + EDR audio decode technology gives these wireless earbuds unparalleled stereo sound quality; and the CVC 6.2 Noise-Cancellation technology is applied to intelligently filter ambient noise, enabling clearer snd during calls and while listening to music PAIR WITH 2 DEVICES & SUPPORT CALL ANSWERING:These wireless headphones can pair with 2 different devices up to 12 meters away simultaneously! Besides,the Bluetooth headset is provided with a mic, so you don't have to stop to answer calls, and through itvoice prompting function, you will know who's calling without reaching for your phones. WATER-PROOF AND SWEAT-PROOF: These wireless earpieces are designed to be sweat-proof and weather-proof.This means you don't have to worry about sweat in your running or jogging process. Nor should you worry about sudden rain. QUICK CHARGE & LONG BATTERY LIFE:The rechargable 70 mAh battery that powers the Bluetooth earbuds allows you to enjoy music for about 6 hours or up to 240 hours of stand-by time and charges in just 1.7 hours.