The DA-4DS is a Door Station from Aiphone that comes in 4-call button and silver colour. The Aiphone DA series is an intercom entry system with a phone handset. The Aiphone DA systems can be expanded for use in small apartment applications. Two and Four tenant door stations are available, and one handset must be purchased for each unit, as well as a power supply for each handset. The handset also includes buttons for releasing the door or opening a garage door or gate. (Additional components are necessary for opening a door and/or external device).