Abstract: The aim of the invention is to provide prior art equipment, especially for firemen, in the form of helmets (2) and/or breathing masks (3) with a display unit for infrared images. A mask (6) for displaying images on a display (20) is provided, whereby the images are recorded by a camera (13). The inventive mask comprises a frame (18) having a seal (17) that, when the mask (6) is used, rests on an assigned bearing surface (5), e.g. the visor (5) of a breathing mask (3), in such a way that a sealed chamber (19) is formed between the mask (6) and the bearing surface (5).