https://www.doorbird.com/downloads/datasheet_d2102-3v_surface_en.pdf
Doorbird Intercom D2102V/D2103V/D2101FV Fingerprint 50/D2101FV EKEY Surface-mounting
$280.58
Stainless steel V4A (salt-water and grinding dust resistant)
Stainless steel V4A (salt-water and grinding dust resistant), brushed (GTIN/EAN: 4260423865389, P/n: 423865389)
Fits only D2102V/D2103V/D2101FV Fingerprint 50/D2101FV EKEY IP Video Door Stations