DoorBird D21DKV BackBox Flush Mounting Housing, Stainless Steel (V2A - Standard), brushed. Click or scroll to zoom Tap to zoom by DoorBird SKU DBD21DKV-V4A BBOX SM Stainless Steel / Salt-Water Resistant - $278.85 Color: Finish Salt-Water Resistant This website is for Authorized Dealers only. Pricing and checkout is disabled unless you are authorized. "Login" or Click "Dealer Application" to apply.