Wireless Stereo Headphones w/ built-in mic. Now you can comfortably enjoy your favorite music without wires! IOGEAR's Stereo Headphones use Bluetooth technology to let you enjoy music up to 33 feet from the source, in beautifully crisp MP3-quality stereo sound. IOGEAR's behind-the-neck design makes the headphones very comfortable to wear even for extended periods of time. You can also easily change tracks*, adjust the volume, and pause your music with the integrated headphone control buttons. The built-in rechargeable battery offers up to 6.5 hours of music play time. A built-in microphone supports use with Bluetooth cell phones. You can even pause your music and pick up an incoming phone call with the press of a button. This unit will works with any Bluetooth-enabled device (computer, PDA, MP3 Player) that supports A2DP and AVRCP Bluetooth profiles. For devices that do not come with integrated Bluetooth, you may use the IOGEAR Bluetooth Audio Transmitter (GMBA201), which transmits audio signals wirelessly to your Bluetooth Stereo Headphones. Free yourself from confining wires and immerse yourself in music with IOGEAR's wireless Bluetooth stereo headphones! *Functionality of the Headphone control buttons require Bluetooth receiver on your music device to support AVRCP profile.