Boss DS-1 Distortion Pedal:

An all time great. Perfect for all rock styles - from 70's punk to 80's classic and 90's grunge all the way to Modern metal tones, this pedal can do it all.The classic DS-1 Distortion pedal provides a harder distortion effect for guitar and keyboard sounds. Instead of toneless, fuzzy distortion, the DS-1 faithfully reproduces all the subtle nuances of playing dynamics--at any volume.

Features:

Classic BOSS Distortion tones for guitar and keyboard
Reproduces dynamics of playing, from soft to hard
Distortion, Level and Tone control to tailor overall sound as desired
BOSS 5-year warranty
Requires 1 x 9v battery (supplied) or PSA-240 power adapter (recommended)