... ,there is almost no noise when door work. Don't like the normal door operator ,you need to adjust the speed ... and buffer speed to a value ,then the door can work ... or normal motorMicrocontroller32bit 30Mhz ST MCU, CANbus techinequesAdjustable parameterSpeed,Opening Width,Holdon tim,Original resetingPower supply110V-250V,60Hz/50HzProfile size4200mm ...