Donner Wah Maker Guitar Bass Effects Pedals Digital Auto Wah Filter 3 Modes True Bypass Digital auto wah filter pedal ,strengthen and gives you sound more character Simple operation allows the Donner wah maker to create vivid rhythm patterns that stand out either in a recording or in a live performance Switch between High mode, Mid mode and Low mode (It can change the depth of the wah effects for high and low) Wah effect focused in three different frequency bands, So the nuances of your playing can come through with an exciting sound. True bypass ,1 year Warranty