I just installed it today, I have my power, ignition, and ground sorted. My unit has 4 speaker wires that go to the OEM amp. I haven't' gotten that far, but feel confident. I should be able to use it tomorrow maybe, but I think it is coming along well. Oh I fished 1 USB up into the center glove box, for mt 1t ssd. This was my old work car I just got it back from my wife. Such a cool car, I think I wan t a 2015 slk 350, love this car!!! I used a moto tool to fit the panel to the lower bottom section. I had to make som backint and glued that module. After I took out the OE radio I cut that shelf out completely. The new machine was such a close fit I decided that velcro iner sides, top and bottom maybe enough. we will see if it comes loose after jumping the rail road tracks. Pretty excited to get my old work car back.