Features:Guitar overdrive preamp effect pedal with 2 models(D/M) to choose.GAIN knob controls the amount of distortion, from just a touch of grit to all-out grind.LEVEL knob dials in some subtle body for always on performance or huge amounts of boost for boosting solos above a dense stage mix.True bypass footswitch for switching between overdrive effect and bypass status.LED light for indicating effects or bypass status. Full metal shell and compact size, durable and portable.Specifications:Input: 1/4 inch monaural JackOutput: 1/4 inch monaural JackPower Supply: DC 9V AC adapter (center minus plug)(not included)Item Size: 9.3 * 3.8 * 3.2cm / 3.7 * 1.5 * 1.3inItem Weight: 140g / 4.9ozPackage Size: 11.5 * 6.5 * 6cm/ 4.5 * 2.6 * 2.4inPackage Weight: 175g / 6.2ozNote: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.Package List:1 * Effect Pedal