Aphex Aural Exciter Type C

Rack-mounted audio enhancer "said to enhance clarity and intelligibility by adding phase shift and musically related synthesized harmonics to audio signals".
[wiki]

Placed on the Pumpkins' official eBay account on 2011/09/29, ending on 2011/10/09 at $32 (reserve not met). It was re-listed on 2011/10/19, and ended on 2011/10/29 with a winning bid of $100. The accompanying text read:

Aphex Exciter Type C 103a. 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".