Electronic flush-mounted belt winder, universally applicable for all common belt boxes from 36 mm width, smooth running due to individually adjustable driving speed, high comfort due to soft start/soft stop function, extensive automatic functions such as daily/weekly/astro program and random control can be individually programmed, menu-guided operation via large, illuminated display, sun/twilight function with S/D sensor (optional) possible. Can be used for roller shutters up to approx. 6 m² roller shutter area and belt length of 7.6 m with 1.0 mm belt thickness, up to 10 m² roller shutter area, 15 m belt length