There's an item that adds Bluetooth functionality to the genuine multi-function system. Installation involves connecting it to the genuine CD/DVD changer, and you can also use the steering wheel remote control. Compatible vehicles include: Crown, Mark X, IS, GS, Previa, Land Cruiser, Land Cruiser Prado, etc. The tools required for installation are as follows: Trim remover 10mm socket Phillips head screwdriver Installation takes about 10 minutes. The main unit is compact, and if you don't use the earphone jack or microphone, it can be stored behind the audio system. My impressions after using it: I used to love my Celsior, but the inability to use music streaming services like YouTube Music and Spotify was a problem. I considered installing an aftermarket navigation system, but I had various requests, such as not wanting to change the original interior. However, by using this item, all the problems were solved, and I am very satisfied.