The utility model provides a case comprising case panel, cover member and connecting member. Said case panel is provided with at least one opening. Said cover member serves to cover the opening on the case panel. Said connecting member serves to mount the cover member at the site of opening of said case panel. The cover member can be selectively mounted or demounted at the site of opening on the case panel according to the needs of application, so that the utility model can form various types of case to meet the needs of flexible configuration and support for various interfaces and to provide customized services.