These Bluetooth Stereo Earphones with Built-in Mic and wireless 4.1 magnetic earbuds are perfect workout headphones that are snug and secure so the headphones stay put while running, biking or at the gym. They have built-in magnets that let you attach the two headphones together when you are not using them and wear them like a necklace around your neck which is convenient way to carry them when not using them. They have CVC noise isolation technology which reduces outside noises and enable clearer microphone sound. Has long battery life and can play up to 5 hours of continuous music. Latest Bluetooth 4.1 technology allows you easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices.