https://www.doorbird.com/downloads/datasheet/datasheet_d1101_flush_housing_en.pdf
Doorbird Intercom D1101V Flush-mounting housing (Backbox)
$111.61
Stainless Steel V2A
(GTIN/EAN: 4260423867383, P/n: 423867383)
Fits only a D1101V IP Video Door Station