Atlas Sound offers traditional autoformer controls to provide excellent stereo performance and maximum speaker-handling capability. The DAT35ST70 includes positive off and full-power pass through at the maximum setting. Contacts are make-before-break for smooth transition.Designed for 25 or 70.7 volt use provide level control in distributed constant-voltage systems and is UL listed. This single gang model mounts standard E.O. boxes 2 1/2" deep. Includes white and ivory knobs, inserts and trim plates.