It's a Kenwood Digital Media Receiver KMM-BT250U is the model number. And since it doesn't have a CD player in it, it's light and short bodied. I have a USB micro thumb drive with tons of old rock and roll uploaded on it, and the radio sounds great with the new 6.25's in the back and new door speakers.
New Project Rough 1986 F150 4x4 Extra Cab
It's so ugly,,,,, I might have to name it "Moco".