No instillation instructions. None. Zip. Nada. Nothing. Only a trouble shooting guide and a booklet for unit functions. A very SMALL booklet with very SMALL print. With very SMALL photos demonstrating functions.They at least include a diagram for the wires. A very SMALL diagram with very SMALL print.Seriously. It's packaged quite nicely. Included wiring harnesses look well made. Unit itself has a high quality appearance. Why not spend a LITTLE more, make a bigger manual AND include at least a few installation hints if nothing else?Will update use and functions after I figure out installation. IF I figure it out.11/09/24 update.....Installed into a 2012 Acadia. Wiring was easy to figure out. Even though it plugs into the vehicle's GPS system, navigation didn't work until I plugged in GPS antenna included with the system. Probably not the best placement, but I just stuck it to the frame behind the radio.As for quality? Unbelievable for a economy unit. Functions are easy to use, touch screen is high quality and responsive, sound is incredible. Watch out for volume! I'd say it's triple than factory stereo! Equalizer is wide range and easy to use. Overall, VERY user friendly!Last off, appearance. Beautiful and looks factory.One last thing, it doesn't power off with the key out. Hopefully it doesn't cause a battery drain if forgotten to power down.I gave it 5 stars just for the overall quality, sound, easy installation, and user friendly BUT it only deserves three because of earlier first review.FOR GOD'S SAKE, PRINT SOME INSTALLATION INSTRUCTIONS!
