1.Electric guitar overdrive effect pedal for guitar players. 2.4 functional knobs(Gain/Volume/Bass/Treble) for adjust the performance of the overdrive effect. 3.for True bypass footswitch for switching between overdrive effect and bypass status. 4.LED light for indicating effects or bypass status. 5.Full metal shell and compact size, and portable. Input: 1/4inch monaural Jack Output: 1/4inch monaural Jack Power Supply: DC 9V AC adapter (center minus plug)(not included) Note: Power Adapter is not included. Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Colour:As Shown Material:Composite Materials Package Contents: 1 x Effect Pedal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.