Controls Voice: Dials in the Overall Sound. Turn it Clockwise for a Fuller Sound with More Lows, Bring it Back for a Thinner, More Midrange Focused Tone. Throb: This Controls the Low End Pulse. It May not be Immediately Evident on the Bridge Pickup, but Switch to the Neck or Add some Dirt and it comes Alive. All the way up for More Throb, Dial it Back for Less. Works Best when the “Voice” is Set to a Warmer Tone. Intensity: This Controls how Subtle or Intense the Overall Effect is. Counter Clockwise from Noon are the More Subtle, Classic sounds. Clockwise from Noon are the More Drastic and Intense Sounds. Rate: Controls the Speed of the Effect. Counterclockwise for Slow, Clockwise for Fast. Level: Controls the Volume of the Effect. Unity is around 1 O’clock, Everything Above that is Boost. Measures 4.75? x 2.50? x. 2.25? with Knobs Power A Standard Regulated 9-18 Volt DC Power Supply with a Negative Centre 2.1mm Barrel. We do Not Recommend any Adaptor that isn’t Designed for Musical Instruments. Do Not Run at Higher Voltages! Powering at 9v Gives a Warmer and More Natural Sound, 18v will be Stronger with More Headroom and “Sparkle.” Does Not use Batteries. Current Draw is 35 mA.