I have 4 of these. They are the single display mirrors - you have to switch back and forth for compass and temperature display, but I actually prefer it, the dual displays have a larger area that can hide something behind you I've found. They all have been tested and work perfectly. I am including the temp sensor with a length of wiring, the mirror harness and instructions for installation. These are great to add to older cars, I have them in mine, it's a simple 5 wire hookup. I will include a wire cover (goes from the mirror to the headliner) and a metal windshield button if you want. $45.00 each shipped.