Universal Wireless Bluetooth Handsfree Hanging Neck Stereo Bluetooth Earphone for All Mobile Phone (Black) Tone+ delivers enhanced audio and bass response and a host of calling features in a sleek, comfortable design Built in apt-X technology reproduces CD quality sound over a Bluetooth connection 10 hours of listening/15 hours of talk time provide all day connectivity Unique, around the neck, wearing style provides all day comfort and ease of use