Aphex Aural Exciter type B
Rack-mounted audio enhancer "said to enhance clarity and intelligibility by adding phase shift and musically related synthesized harmonics to audio signals".
Placed on the Pumpkins' official eBay account on 2011/09/29, ending on 2011/10/09 at $100. The accompanying text read:
Aphex Aural Exciter Type B. Used by Billy Corgan. The unit has been kept in a smoke-free studio environment. The unit comes with an attached power cable. No other cables or manuals are included. A certificate of authenticity will be included. Unit is sold "as is".