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(2) Rockville VOL7035 White 35w 70v Wall Volume Control Zone ControllersThe VOL7035 by RockvilIe is a 70 volt 35 watt wall volume controller. Our volume controllers are some of the best on the market. These are for constant voltage systems such as 70 volt or 100 volt. The reliability and accuracy is what makes a big difference. Our 11 step controll..