A mounting device for electronic accessories for vehicles has a mounting having a shape matched to the shape of an accessory to be received. A mechanical lock is connected to the mounting. The lock has a locking bar that engages a housing recess in the form of a groove or a housing edge of the accessory received in the mounting. The lock has a key for manual actuation of the lock by rotating the key in the lock and moving the locking bar in and out of engagement of the housing recess or the housing edge.