Latest Bluetooth 4.1 technology support CVC6.0 noise cancellation /Apt-X /A2DP. With the latest world famous CSR8635. Provide High-fidelity and natural Stereo Sound with super audio performance. Just say “Yes” or “No” to pick or reject call. Combine with Voice control function, such as Siri Control . Realize the true meaning of handfree. Extremely convenience for your life, enjoy high-tech experience. Stylish Lightweight and Sweatproof perfect for travel or office use, can be use as sports earphones. Built-in HD and sensitivity microphone. Makes you enjoy clear and natural sound when calling. Compatible with most Bluetooth-enabled devices. This will connect automatically with a phone paired previously.