Electronic surface-mounted belt winder, ideal for confined spaces, extra large control buttons for clear manual operation, memory function - simple time function, repeatedly programmed opening and closing times in 24-hour rhythm, quick and easy surface-mounted installation, one programmable up/down switching time each, setting button for programming discreetly placed behind the cover panel, simple summer/winter time changeover, can be used for roller shutters up to approx. 5 m² roller shutter area and belt length of 5.0 m with 1.0 mm belt thickness