Besign SH01 Bluetooth V4.1 Headphones, Wireless Stereo Sports Headsets, Running Gym Exercise Sweatproof Earphones, Earbuds with Built-in Mic for Hands Free Calling High-quality Sound: Latest Wireless Bluetooth 4.1 Technology with A2DP stereo music, clear sound, ideal for high quality music. Powerful audio driver offers balanced audio and crystal clear sounds with dynamic base performance. Noise Cancellation Technology: Built-in microphone with CVC6.0 noise cancellation let you get high quality, hands-free phone conversation with clear voice even in noisy environment like inside a gym and running/cycling on the road. Comfortable Fit with Sport Style: Stylish sweat-proof, around-the-neck design headphone guarantee 100% stable and comfortable wearing experience for running, jogging, cycling, driving, camping, hiking Gym exercise and other outdoor sports. Long-time Enjoying: Up to 8 hours of talk time or 160 hours of standby with a full charge; battery level indicator with iOS devices to keep track easily Package Content: Besign SH01 Sport Bluetooth Headphone, USB Charging cable, 4 x Earbuds, User manual, Travel Pouch, 12 months Worry-Free warranty and friendly customer support service.