Feature: 1. Guitar overdrive preamp effect pedal with 2 models(D/M) to choose. 2. GAIN knob controls the amount of distortion, from just a touch of grit to all-out grind. 3. LEVEL knob dials in some subtle body for \"always on\" performance or huge amounts of boost for boosting solos above a dense stage mix. Specification: 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 Jack Output: 1/4 inch monaural Jack Power Supply: DC 9V AC adapter (center minus plug)(not included) Item Size: 9.3 * 3.8 * 3.2cm / 3.7 * 1.5 * 1.3in Item Weight: 140g / 4.9oz Package Size: 11.5 * 6.5 * 6cm/ 4.5 * 2.6 * 2.4in Package Weight: 175g / 6.2oz 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. Package List: 1 * Effect Pedal Package List: 1 * Effect Pedal