Review on Yomikoo USB AUX Adapter: Enhance Mazda Car Audio with CD Changer Compatibility by Ryan Mosqueda

A little note. I see the details saying this doesn't work with 2003-2004 series Miata Bose head units. Not true. It works. You press the "CD" key and it switches to it. The downside is that you can't play CDs while it's plugged in. But there doesn't seem to be many casualties. Who wants to keep CDs in the car? So yes, if you have a 2003-2004 Miata LS or Mazdaspeed with a 4H64 head unit and want to add aux (and therefore a Bluetooth adapter) to your Miata with a Bose head unit, this is the way to go. It's also significantly cheaper than the Crux device.