Boss ME-20 Guitar Multi Effects Pedal Compact, rugged multi-effect pedal Die-cast metal chassis Dual-mode operation (Manual, Memory) Simple interface Three footswitches Expression pedal 17 effects 30 patches (3 patches, 10 banks) LED display 24-bit/44.1kHz audio resolution AC or battery power 1/4" instrument input 1/8" aux input 1/4" mono/stereo output 1/4" headphone jack TRS footswitch jack AC Adaptor jack Includes 6 (AA) type alkaline batteries &lt;B