See also:

Cup holder in the rear seat armrest
Do not sit on or support your body weight on the rear seat armrest when it is folded down, as you could otherwise damage it. Close the cup holder before folding the rear seat armrest up. ...

Safety
Mercedes-Benz's Electronic Stability Program, antilock brakes, front and rear side-impact airbags, and side curtain-type airbags are standard. ...

PRE-SAFE® (preventative occupant protection)
WARNING The PRE-SAFE® system reduces the impact of an accident on vehicle occupants, as long as their seat belts have been fastened correctly. Although your vehicle is equipped with a PRESAFE ...