Electro-Harmonix Foot controller for 22500 Dual Stereo Looper

From the listing

Seller's description

The 22500 records and plays in up to 100 Loop Bank. The Foot Controller makes it easy to navigate thru the 22500’s 100 Loop Banks, moving up or down by either one or ten banks at a time.   Quick Specs - Controls bank up/down selection on the 22500 Dual Stereo Looper - Can increment or decrement one or ten banks at a time - Uses a standard ¼ inch mono instrument cable as the connection