Airfrex AF57 Bluetooth receiver is an wireless audio adapter that custom designed and made for Bose passive headphones and headsets, this music adapter is compatitle with a wide range of Bose classic headphones, including Bose SoundTrue2 and SoundTrue, Bose AE2 and Bose AE, Bose OE2 and OE, these headphones are all wired and with detachable cables, with our wireless audio receiver AF57, you can connect your Bose wired headphones via Bluetooth with your smartphones and tablets or even computers( bluetooth enabled) and enjoy your music or watch video without the disturbance of cable, your wired headphone turns into a Bluetooth headphone. More importantly, there is no audio quality compromise at all, we use the latest CSR Bluetooth4.1 chip and dedicated headphone amplifier chip in this tiny adapter, making sure the acoustic performance is super and unparalleled.