Features:A great adjusting distortion pedal， perfect for beginners to professional enthusiasts. Simulates the characteristic distortion and cabinet sound of a guitar amplifier.Extra amount of gain boosts high frequencies for greater distortion effect.True bypass provides transparent tone.Bass and high tone control.LED indicator shows status of effect and battery condition.The pedal can be powered by a battery or an optional AC adapter.Specifications: Model: SE-4HColor: RedMaterial: Aluminum alloyInput impedance: 1 OhmOutput impedance: 10K OhmRunning current: 18mAPower: 9V battery / AC adapter (Neither included)Item size: 11.5 * 6.5 * 6cm / 4.5 * 2.6 * 2.4inItem weight: 278g / 9.83ozPackage size: 13 * 9 * 6cm / 5.1 * 3.5 * 2.4inPackage weight: 315g / 11.11ozPackage List:1 * Effect Pedal1 * User Manual (English & Chinese)