Abstract: An operating unit for the manual control of a plurality of functions of different apparatuses, especially for hospitals or hotels, has a modular design and comprises a box-like main module and at least one slat-like submodule. At least one device, the function of which is controlled by manual key operation, is arranged in or at the main module. Accessory devices can be arranged within the submodules. The unit is characterized by comfortable handling and great versatility.