Features: Multifunctional 4-in-1 guitar effect pedals, with CLASSIC AMP, Booster, Analog Delay and FX LOOP, easy for operation, excellent performance. Classic Amp with extra amount of gain boost to higher frequency, output volume and EQ level adjuster. TOP BOOSTER as a preamp pedal provides up to +20dB of unadulterated boost with multi-dimensional, shimmering highs and lows, no ear fatigue, good dynamic sound. ANALOG DELAY offers a natural sounding digital/analog delay with analog direct signal path. FX LOOP can access other effects or effects chains. True bypass for eliminating any signal interference when switched off. With 6.35mm Input, Output and FX Loop interface, powered by DC 9V port(the adapter not included).