Explaining some of the features of the 2015 c300
Memory Seat
It lets the car save and recall your preferred driver's seat position.
The memory seat lets you save your preferred driving position.
Simply adjust the seat, press M, then press 1, 2, or 3 to save it. You can save different positions for different drivers.
To use a saved position, press and hold the corresponding number, and the seat automatically moves back to that position.
Basically, it means you don’t have to readjust your seat every time someone else drives the car.
driver's seat to your saved position.