Built-in magnets let you attach the two headphones together when not using, and wear like a necklace around your neck, a convenient way to carry around when you don't need them Comfortable in-ear design, snug and secure, make sure the headset stay put and your music stays smooth when you are running, cycling, exercising and doing other activities CVC Noise Cancellation 6.0 technology reduces outside noises, enable clearer microphone sound when talking to your family or friends; you get high quality, hands-free phone conversation even on the street or inside shopping mall Latest Bluetooth 4.2 technology; easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices.