K06931 Expandable Due Fili basic audio kit containing 1 Due Fili electronic unit for 6931 audio entrance panel, for 1300, 1200, 1200 reinforced, 8000 series cover plates, filing cabinet and letter holder, 1 power supply 6922.1.

The kit is designed for connection of a separate camera, with the addition of art. 693T, and can be used for mixed audio/video systems.