Compact guitar effect pedal with adjustable bass, treble, and drive. Can be used as a booster, or as an overdrive by increasing the drive. - Model: Boost - Brand: amazonBasics - Number of Knobs: 3 - Functions: Bass, Treble, Drive adjustment - LED Indicator: Illuminated - Input Terminals: 1/4 inch jack - Power: DC 9V - Dimensions: Compact size Thank you for viewing. ※9V batteries cannot be used. ※Although it is a new, unused item, it has been opened to check for power. Also, it originally came in simple packaging, so there is no box.