Andoer SE-4H Metal Distortion Electric Guitar Effect Pedal Aluminum Alloy Housing True Bypass 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 adaptor.