... and one set 12V nodeNoise:<60 dBSafty:Protection for over-current,over-voltage,and faultPower supply:AC 220 V (+6 ... warning against over-current,over-heat, over-voltage,over low voltage,can ensure security.Multifunction extended interface,such as Door Access control ... installationThe door should have door frame,if not,should add door holder to the door,then can install door opener. The width of door ...