Okko Diablo Gain Plus, two channel distortion pedal for electric guitar, low to medium overdrive, controls for Body (mids and compression), gain (distortion), Tone (Treble), Feed (bass) and level (volume). Plus button switches between two gain settings, Plus controller for adjusting the second Geinsettings, HI / Low switch, HI switch position doubles the internal voltage to 18V for more dynamic, more headroom and tighter bass, operating with 9V battery or optional power supply 9V DC - inside (# 108096), made in Germany