Video Doorphone is mounted in a flush-mounted housing. Built-in RFID reader allows to control the electric strike using key fobs, proximity cards and tags functioning in the Unique EM 125kHz standard. The user configures himself whether he will open the entrance with the PIN code entered on the keyboard, or with a keyfob or proximity card, or by combining both these operations.

The S20DA is designed to cooperation with video doorphones and panels working in analog VIDOS system.