Review on 🔦 Gentex GENK20A Auto Dimming Mirror with Compass Temperature: Enhanced Visibility and Navigation Aid by Greg Greiner

If it had been professionally installed they would not be able to program the compass. Yes! I brought it home from the installers and it programmed itself. Anyone who claims to be difficult to program should reconsider this observation. Very happy with its factory look and I drove at night hoping someone would drive behind me with high beams on so I could watch the auto dimming feature. The thermometer works great and is very accurate. I often check it with my climate thermometer and smartphone. Never more than 2 degrees. It's very specific in my book.