A mains electricity (AC-powered) device designed to receive and process the electronic signals sent from a video endoscope or endoscopic video camera; it does not include the endoscope nor light source and is not designed to control the endoscope. It may have additional features which compensate for/enhance the colour and light qualities provided. The resulting picture images are sent to and shown on a visual display unit (VDU), typically to assist the endoscope operator with an ongoing intervention and often to allow the patient visualization of the process; the images can be recorded on a video recorder or stored on computerized media.