When you re ready to go beyond the boundaries of brutality, you have to throw some serious weight to get the job done. That s when you break out the HEAVY DISTORTION HD300. Outrageous Distortion In addition to providing loads of devastating distortion, this little sonic warhead allows you crank up the bottom-end and the gain, to lay waste to everything in your path. Just Turn a Few Knobs With its dedicated GAIN BOOST, DISTORTION, TONE, BOTTOM and LEVEL control, you can dial in a trademark sound all your own. The blue status LED tells you when this pedal is activated, and the rock-solid on/off switch maintains outstanding signal integrity in bypass mode. You can power this behemoth with a 9 V battery or a PSU-SB DC power supply (not included).