Compact device for MIDI control. - Model Name: MIDI MOUSE - Brand: TECH 21 NYC - Function: MIDI Controller - Terminals: MIDI OUT - Power: DC connection - Country of Manufacture: USA Thank you for viewing. Simply sends program change information to MIDI devices. Allows you to step up and down through patches on MIDI-compatible multi-effects units, etc. I think it's relatively clean, but it's an old device, so there are some minor scratches. It was used indoors, so it was not handled with shoes on.