motor vehicle and or operation of the motor vehicle the system further comprises an emergency key for mechanically locking and or unlocking the door of the motor vehicle and or for the operation of the motor vehicle the emergency key is received inside the housing in a substantially complete manner application_number US 23137605 A description fig1 shows a practical example for a key system 1 situated in a first locking position for a vehicle with transmitting electronics arranged in a housing 2 for contactless locking and or unlocking of the door of a vehicle and or for operation of the vehicle and with an emergency key 3 for mechanical locking and or unlocking of the door of the vehicle and or operation of the vehicle the emergency key 3 is fully accommodated in the upper edge 4 of housing 2 the emergency key 3 has an opening 5 into which as shown in fig5 and fig6 a key ring 10 can be threaded the emergency key 3 as shown in fig2 can be partly pushed out from housing 2 into a second locking position in this second locking position the opening 5 as shown in fig5 and fig6 a key ring 10 can be threaded in addition the emergency key in the second locking position.