https://www.doorbird.com/downloads/datasheet/datasheet_d1101kh_surface_housing_en.pdf
Doorbird Intercom D1101KH Surface-mounting housing (Backbox)
$376.93
Stainless steel V4A (salt-water and grinding dust resistant)
Stainless steel V4A (salt-water and grinding dust resistant), brushed (GTIN/EAN: 4260423867628, P/n: 423867628)
Fits only a D1101KH IP Video Door Station