Attenuator, 40 W / 100 V, 45 x 45 mm, built-in security paging system.
CV-40 volume controls are designed to work on 100V input and output lines,
with a regulations of 6 steps, by means of 12 positions endless switch.
In order to faciliate the volume control, a "zero" has been inserted
between every two levels.
Universal flush-mounting box included, optional frame.