Modular electronic device

A modular electronic device, for example a car radio, a navigation system or a radar detection system, said device comprising a fixed module fitted with external electrical contact elements, which is to be mounted with its rear side on a wall, for example a dashboard, and a detachable module fitted with electronic components and external electrical contact elements, wherein the fixed module and the detachable module comprise mating guide surfaces, which guide the detachable module to the correct position upon connection thereof to the fixed module, wherein the detachable module can be connected with its rear wall to a front side of the fixed module in such a manner that the external electrical contact elements of the two modules are interconnected, and wherein one of the front side of the fixed module and the rear wall of the detachable module is provided with at least one magnet and the other one of said front side of the fixed module and rear wall of the detachable module is provided with a metal element, such that the detachable module can be connected to the fixed module through a magnetic force between the magnet and the metal element sufficiently large for pulling the detachable module firmly into contact with the fixed module.