The legendary sound brought to a new standard: Enjoy comfort, freedom, and the best sound around. Bluetooth 4.1 enables wireless connectivity, legendary Pro Audio Sound provides a dynamic listening experience, and sculpted ear cushions allow for unprecedented fit, and comfort around your ears. With a rechargeable battery offering 10 hours of performance and best music, videos, and games, now you can dance alone or with a partner free from limits. A built-in microphone also allows for easy call access. Features: Bluetooth 4.1: Connect to any Bluetooth-enabled device for amazing sound quality without the hassle of wires. Legendary Pro Audio Sound: Enjoy the same elevated experience and incredible sound has been delivering to concert halls, studios and living rooms for years. Best-in-class Ergonomics: These headphones are ergonomically designed to fit the unique contour of your ears. You'll experience unprecedented comfort. Listen longer and enjoy it more. listen to your music, videos, and games - easily and wirelessly. Built-in Microphone: Enjoy more natural sounding voice calls with a built-in microphone with echo cancellation technology. To connect the Bluetooth there is need of long press of power button for at-least 5-10 sec, then it starts pairing up. To connect the FM with headphone, as this headphone needs proper area where there is full network of FM then only it will detect the FM signals