The bed base can be set to 6 different heights, so that it's at the same level as the parents' bed (although it can be 1 or 2 cm below it without any risk). Furthermore, the wheels can be removed if using these bed base settings the cot is still not at the same level as the double bed. This way, there will be 12 heights instead of 6 to choose from.
** (Height from the floor to the top of the mattress)