The button functions for the Care Key are the same as for the regular key. If no speed limit has been set, the vehicle and the key work as normal. Like other keys, the Care Key can be linked to a user profile to save personal settings in the vehicle.
The speed limitation can be set by the user profile who is the administrator. The speed limitation is activated when the vehicle is unlocked with a Care Key, or when the driver's door is opened and the vehicle detects a Care Key on the driver's side.
The ability to set a maximum speed for use with a specific key is intended to give the vehicle owner increased peace of mind when handing over the vehicle to a young or inexperienced driver, a valet, a workshop, etc.