I bought the earlier version of this adapter because it worked perfectly with a set of headphones I already have. However, this version of the adapter now only works with the manufacturer's headphones (i.Tech Bluetooth headset/headphone) and not those with a password or default key of 1234 which most bluetooth stereo headphones have.So if you are hoping these will work with your headphones, check the passkey. If your headphones default key is 1234, this will not connect to them.