Product i'm trying to find a manual on

Question

hey,
well my brother that past away had a truck he had been working on for a while.his wife gave us his truck to keep in memories. he had put a Jensen VM9411 AM/FM/CD/DVD 7 inches LCD and TFT in it. i'm trying to find a manual or something becuase i'm trying to figure out how to use it. I would apreciate it if i got help. thank you for your time and appreciation.