Sony Extra Bass Wireless Bluetooth Headset

Bluetooth audio streaming with AAC and apt-X support and Electronic Bass Boost circuitry for added bass emphasis;
Built-in microphone for hands-free phone calling;40mm drivers for wide frequency response;Comfortable around-the-ear design with sophisticated swivel design for portability;Rechargeable battery for up to 20 hrs music and passive mode for normal, corded operation without battery.