Mission Engineering EP-11 Expression pedal designed for use with Digidesign/Avid 11 rack and Pro Tools. 
As new with original open box. 
Check you compatibility before purchasing. 
 
Description: 
The linear potentiometer is matched exactly to the specifications of the Eleven Rack for a precise and natural response. Just connect to the Exp. Pedal input on the rear panel of the Eleven Rack with a 1/4″ TRS cable, and select ‘EP-11’ from the Eleven Rack expression pedal settings.

Using the Eleven Rack with a MIDI controller? Just flip the toggle switch on the EP-11 and connect it to an expression pedal input. The EP-11 is compatible with many popular MIDI controllers including the Voodoo Lab Ground Control Pro.