It will then clears back to normal when the brightness reduce from cars in front or behind automatically. It is easy to remove and mount the new one on yourself without the technician. Good Luck and thanks for looking.... The item "FACTORY OEM 2017 2020 Mercedes E350 E400 AMG Auto Dim Rear Mirror Homelink" is in sale since Tuesday, June 8, 2021. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Interior Parts & Accessories\Rear View Mirrors".The seller is "auctiondealonline" and is located in Sunnyvale, California. This item can be shipped worldwide.