I am selling this as I purchased it new to use with the BOSS WAZA Tube Amp Expander, which I am also listing, but I have hardly used it. It has been tested and is in working order. Here is the manufacturer's description: 1. Expands the functionality of the "GA-FC" foot controller for amplifiers. Allows for more flexible control of compatible BOSS amplifiers. 2. Features six footswitches in a rugged enclosure. 3. Can control amplifier channel switching, effects on/off, and more. 4. Two-color LED lights for easy status confirmation. 5. Equipped with two dedicated expression pedal jacks. 6. Offers a variety of control methods by switching the MODE switch. 7. EXP PEDAL 3 mode allows connection of a third expression pedal. 8. EXPAND mode allows for connecting another GA-FC EX or GA-FC. 9. FOOT CONTROL 2 mode allows for simultaneous control of two amplifiers. 10. Can be used as a GA-FC with standard GA-FC compatible amplifiers. 11. Requires no power and can be connected and used with a single included TRS standard cable. Included accessories: Instruction manual, foot controller connection cable.