noun
door intercom; intercom
A door intercom system, typically with a camera and speaker, used in apartments and houses. Wasei-eigo from 'door phone'.
wasei-eigo (Japanese-coined English), from door phone
マンションのドアホンが壊れて、来客がわからなかった。
The apartment's door intercom was broken, so I didn't know when visitors came.
ドアホンで宅配便の人が来たことを確認した。
I confirmed through the door intercom that the delivery person had arrived.