Akuvox R20B On-wall (Five Buttons) SIP Intercom with Five (5) Buttons (Video & Card reader) , Body material: Aluminum Alloy , Camera: 2M pixels, 110°(H) / 58°(V) , RF Card Reader 13.56MHZ & 125KHZ , Button: 5 call buttons with name plate , Output Relay: 2 output relays for door opener , Water-proof & Dust-proof: IP65 , Installation: Surface Mount model , PoE (IEEE802.3af, Power-over-Ethernet) , Two-way audio communication over IP networks with Echo Cancel , Complies with SIP standard for easy integration in every SIP PBX