Estudiante86

Hey folks, I'm new here, was hoping someone might be able to help me out. I'm a university student (studying Criminology) working on a project that deals with security in a small shopping center. I ran into some of these white domes near regular CCTV cameras (see picture; sorry for the poor quality). I was wondering if anyone might be able to tell me what they are and what they are used for? Thanks all for your time.