Norjack Bluetooth Headphones British import CSR4.1 Wireless Sport Stereo Hang ear type Noise Cancelling Sweatproof Headset,Black Comfortable and secure fit: With Ergonomic design and silicone ear hooks, Norjack Bluetooth Headphones are secure behind your ears and rest comfortably in the ear canal. Premium soft smooth silicone gel surface helps sweat proof. It is great for Gym, Running, Jogging, Hiking, Cycling, and impact Sports Superior sound and amazing volume: The in-ear design offers incredible sound quality with deep bass and crystal clear treble, no matter your taste in music. Works great for soundtracks, audio books, relaxing sounds Reduction noise: With DSP Spatial Noise Reduction technology, the Bluetooth Earbuds reduce background noise, so you can focus on your favorite music, no matter where you are Bluetooth CSR4.1 and universal connectivity : We give you the power of Bluetooth CSR4.1 technology for seamless syncing to your favorite wireless devices, including telephone and Android cell Phones, Windows Phones, and more up to 10 meters 33 feet Hours of listening time and voice prompts: The Bluetooth Headset can deliver up to 6.5 hours of play time on a full charge. English voice and Chinese Voice prompt allows notification of incoming calls and phone numbers, so never miss a phone call