Share Component Limited SBS28 electric opening and closing curtains Series 220V / 50HZ AC motor, external radio receiver in the control or wall switch; power outage, you can track the same track as the manual hand pull the curtains closed; no set itinerary, with automatic memory blackout function; optional A-type or S-type track; track using electrophoresis technique treatment, with low noise and smooth pull characteristics; according to the different sites and requirements, select straight track or curved track.