The boss sd 1 super overdrive pedal with power supply is the essential overdrive for pros and beginners alike'. '.strtoupper('e')arning itself legendary status based on 40 years of peerless performance this is easily the most unique overdrive pedal on the market'. '.strtoupper('a')ll thanks to clever asymmetrical clipping'. '.strtoupper('m')ost overdrive pedals clip symmetrically giving a slightly thinner sound thats because asymmetrical clipping creates more harmonic overtones'. '.strtoupper('t')his gives a richer thicker sound overall'. '.strtoupper('i')ts a design feature which is patented by boss roland meaning the sd 1 is the only overdrive pedal that can offer this incredible tonal secret'. '.strtoupper('a')nd all this iconic tone comes included with a boss psa 230 too'. '.strtoupper('s')o you not only receive a pedal with serious sonic attitude and versatility but an official boss power supply with almost 10 feet of cable length giving you immense performing freedom both tonally and physically.