This came with my car in the trunk. I assume it needs some work I tried testing it but I didn’t get nothing out of it. blue wire hot grounded the body I tried to hooked up a speaker quick but I got nothing out of it. My car has a blue tooth stereo in it. so you guys that know how to work on these I figure it’s worth $125 shipped. As is needs repair dial moves presets work on off button works too. Johnny!