Enfig VW1-BTA-AUX08/03/2019 ByKurt Allowed me to upgrade the 2003 Jetta Monsoon factory unit to bluetooth, and keep the factory look, sound quality, and simplicity of the original unit that I like; audio amplification tech has not changed since 2003, so no loss, only gain of bluetooth function. Installation was reasonably straightforward with youtube videos, fits perfectly if you tuck it behind plastic flap in the back of the receiver cavity. I had a question about where to put the bluetooth receiving dongle that was answered promptly. Very impressed, since rather than replacing the whole radio, this upgrade saved me money, no e-waste for me and the world to deal with, and retains original audio quality and dash look. Thank you, well done!