Helping diminish the glare of headlights from behind your vehicle, the auto-dimming mirror reduces the reflection rate of your inside mirror to dampen overly bright lights and help improve your rear view during nighttime driving. It also features LED lighting to illuminate the gearshift area. Provides automatic progressive dimming of the inside mirror, reducing glare caused by the headlights of vehicles behind. Helps relieve glare that can lead to temporary night blindness, increased average stopping distances and slowed reaction time. Helps to improve nighttime driving safety. Helps reduce eyestrain and driver fatigue. A car is fast approaching from the rear. Headlights begin to blind you. No worries. The Auto Day/Night Mirror automatically darkens to reduce the glare. No hand adjustments necessary.