With a brand new car, you spend a pretty penny to get the factory installed Auto Dimming Mirror. If you didn't splurge then, you're in luck! This Auto Dimming Mirror is easy to install - it clips right onto your existing rearview mirror. It runs on 2 standard lithium batteries for 1000 hours. It adjusts to day or night driving, and is even smart enough to shut off if it doesn't detect the car's movement after a while. We love it - no more glaring headlights from the traffic behind you. Brown tint.