Protective-Hood for D2101KV Video Door Station, Stainless Steel V2A, brushed, for in use with surface mounting housing DoorBird D2101KV surface mounting housing (backbox) Add this to your D2101KV to allow it to be surface mounted. Perfect for retro-fits. 2 finishes available to match your Doorbird: V2A Stainless Steel is IP65, V4A Stainless Steel is IP65 with chrome-nickel steel with molybdenum additive for harsh conditions and is Salt-Water resistant.