Multi-effects unit for bass with a variety of effects. - Model: ME-20B - Type: Bass Multi-Effects - Color: Silver/Red - Input/Output Terminals: INPUT, AUX IN, R-OUTPUT, PHONES, DC IN - Switches: SFX, COMP, DELAY - Condition: Used Includes AC adapter, dedicated case, and downloaded instruction manual. Operation has been confirmed. It works without any problems, but please understand that this is a used item before purchasing. The photos are everything.