The DoorBird D21DKH is a Flush-mounted IP Video door intercom for Multi-Dwelling residences with a brushed Stainless steel housing. You can see your visitors, talk to them and open the door via smartphone and tablet. The D21DKH sends push notifications to up to 8 users and can be used remotely use via smartphone and tablet. The DoorBird D21DKH delivers sharp HDTV 720p live video in 110° viewing angle and detailed night vision. The DoorBird connects via wired Ethernet. The free DoorBird app works with Android and iOS.