... Keep closing compulsoryAuto program:Open signal→Unlock→900 open door→Time delay for opening→Closed→LockedDoor Open degree: ... voltage,can ensure security.Multifunction extended interface,such as Door Access control device, Infrared/Microwave detector,Alarm.Remote ... Notice for installationThe door should have door frame,if not,should add door holder to the door,then can install door opener. The ...