Electric guitar preamp effect pedal for guitar players. 4 functional knobs(Gain/Volume/Bass/Treble) for adjust the performance of the effect. True bypass footswitch for switching between effect and bypass status. LED light for indicating effects or bypass status. Full metal shell and size, durable and portable. Input: 1/4 inch monaural Output: 1/4 inch monaural Power Supply: DC 9V AC adapter (center plug)(not included) Item Size: 9.3 * 3.8 * 3.2cm / 3.7 * 1.5 * 1.3 inch Item Weight: 155g / 5.5oz Color: orange Material: zinc aluminum alloy Package Contents: 1 * Guitar Effect Pedal Note: Power Adapter is not included. use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.