They are completely replace the mirrors, and 't effect any feature or functionality e.i electric folding, dimming which will all keep the same Features:With Heating, glass adjustment, folding, memory, turn signal, floor light,Black Cover Cap Installation:Direct replacement, modification highly recommended-Instruction not included Required basic knowledge to remove the old mirrors and after that install new set Compatible with the following vehicles: For W204 2011-2014 C180 C200 C220 C250 C280 C300 C320 C350 C63 Colour:Black Material:ABS Position:Left Package Contents: 1 Folding Rear View Mirror Assembly Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.