It is auto-dimming has LED for alarm system. This unit should fit the following BMW Models but check with your dealership if you are uncertain.
Please check with your local dealer for exact application or before making any custom installations. Only take a few minutes to replace the mirror. The auto dimming will darken the mirror automatically when the cars behind you or on the side is too bright or with high bean as well as cars from opposite direction with to bright headlight or high bean. It will then clears back to normal when the brightness reduce from cars in front or behind automatically.
Dealership will cost over a few hundred dollars just for the mirror. The item "Factory OEM BMW 228i 235i 428i 435i Auto Dim Rear View Mirror Compass Homelink" is in sale since Wednesday, May 30, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Interior\Mirrors". The seller is "auctiondealonline" and is located in Sunnyvale, California.This item can be shipped worldwide.