Sprint L2 intercom. 2-wire technology NON-accessory wall-mountable. It is equipped with electric lock activation button and configurable button for auxiliary functions staircase lights on, door unit activation, concierge switchboard call. It has terminals for connecting an external floor call button. If installed in video or mixed audio-visual systems as the last upright or leg fixture dappartamento, it must be equipped with line termination 3499 connected in ENTRA EXIT on the intercom itself. The ringer volume adjustable in three levels by special selector switch.