Sealable sheet steel housing with a swing door for VdS-compliant installation of an MB-Secure PRO computer board, expansion modules, power supply and batteries. With built-in cover contact and enclosed tear-off protection The multi-part construction with rear panel and mounting bracket as well as removable housing frame enables uncomplicated installation and wiring of the electronic components on the rear panel with subsequent assembly of the housing frame. The GSM cable feed is sabotage-protected inside the housing. The cable feed can be either surface-mounted or from the rear. Up to two batteries can be secured in accordance with VdS using the mounting brackets and optional mounting accessories 055280 fixing and Velcro tape.