Superior sound quality. With DSP intelligent noise reduction technology, the item can deliver high quality music and enjoyable listening experience for compatible devices. Bluetooth V4.1. Easy to pair with your smart phones, tablets and other Bluetooth enabled devices. Strong Wireless Signal. You can enjoy skip-free music in a 10-meter working distance. Ultra long battery life. The Bluetooth headphone supports up to 4 hours of talking or playing music with 60mAh polymer Li ion battery for one off full charge.