Electronic surface-mounted belt winder, ideal for confined spaces, extra large control buttons for clear manual operation, extensive automatic functions: weekly/weekend program, quick and easy surface-mounted installation, setting button for programming discreetly placed behind the cover panel, sun/twilight function possible with S/D sensor, 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