Features: Flanger guitar effect pedal with true bypass. With 4 functional knobs to adjust the performance of the effect. LED light for indicating effects or bypass status. Full metal shell and compact size, durable and portable. Comes with a small pouch for convenient storage and carry. Functional Knobs: --DEPTH knob: adjust the depth --RES knob: adjust the output signal of the delay effect when back to input end --RATE knob: adjust the speed of delay variation --MANUAL knob: adjust the length of the delay time