SG-3D is the combined equalizer that has three unique functions
in one unit. First is the frequency expander, se cond is a mid -band
peak control , and third is a flat booster. Another great feature of
SG-3D is unlikely conventional Bass / Middle / Treble Equalizer
system that change over all gain while control the frequency
character. The SG-3D is designed to keep the gain constantly that
provides operation stabil ity while you are playing your guitar on
the stage.

Features :
Bypass Circuit system
Powered by 9 Volt batteries
About 1,000~2,000 hours ( 9 V Alkaline)