... microcomputer digital chips ,giving the control unit multiple programmable modes including provision to interface with builidng security system, monitoring the ... doors position status,built-in UPS,etcb)Wide operational parameter setting like speed ... 45cm/sClsosing speed10cm-45cm/s10cm-43cm/sHold on time:0-9sMotorbrushless 24 volt DC,55W ,50db noise,high ...