Alcad DIGITAL TWISTED PAIR GRF-411 Mode D'emploi page 18

Adjust the volume level on the entrance
panel and on the monitors/telephones (1).
If there is acoustic feedback, adjust the
feedback control ( ) (2) (Feature
available on certain models only). It is also
possible to regulate the volume of the beep
(3).
Close the panel, press it against the flush-
mounted box and fix it to this using the
clamping screws.Use the tool provided
DIGITAL VIDEO DOOR ENTRY SYSTEMS
Adjust the video unit's view angle until
getting the desired orientation.