Features: Adopts advanced BT4.2 technology, which provides you stable connection and transmission, widely compatible with most BT-enabled devices. Built-in high sensitive microphone for hands-free calling. Supports noise reduction and echo cancellation technology, providing super clear sound quality. Supports voice prompt function and it can connect two mobile phones simultaneously, very convenient to use. It can connect automatically with the device which has paired previously. Ultra-light weight and ergonomic design brings you comfortable and cozy wearing experience. Unique neck-strap design and magnetic headphone head for easy carrying. It will automatically power off after 5 minutes if the BT-enabled device is disconnected with the earphone. Easily controlling the buttons to answer/hang up/reject call, play/pause music, adjust the volume and switch previous/next song.