This unit automatically folds and unfolds the mirrors in conjunction with the keyless entry system. It's ideal for preventing contact with other vehicles when parking and for confirming that the doors are locked. It automatically folds when the central locking system is activated (locking) and automatically returns to the original position when the central locking system is deactivated (unlocking). Compatible with vehicles with electric door mirrors. Compatible with all systems, including smart keys and push-button start. ◆ Energy-saving design with zero power consumption after the mirrors are folded. ◆ Operation with the existing switch is still possible (existing switch takes priority). ◆ Compatible with vehicles equipped with speed-sensitive door locks (mirrors will not automatically fold while driving). *Due to the specifications, continuous opening and closing of the door mirrors may not be possible, but this is not a product defect. I had this installed on my ML21S ROOX, but removed it when I bought a new car. It was used for about 3 months.