A profile determines how two devices talk to each other. The way Bluetooth manages to work between computers, keyboards, mice, headsets, cell phones, and many other devices is through profiles. I have some remarks about the headset itself at the end. This post is first and foremost meant to provide insight into the world of Bluetooth stereo audio on the Mac and the iPhone, even though I only tested with the MM450. After a few months of use, however, I'm now ready to share all the sordid details. So, when I ordered my Sennheiser MM450 Bluetooth headset/headphones with noise cancelation, I didn't really know what to expect.
Then nothing much was heard about the subject ever again. The lack of support for Bluetooth stereo headsets was a staple of every forum thread after the introduction of every new iPhone hardware or firmware for years-until it finally materialized.
