Amazing Quality!  I Will Buy Again!
Got these for a Christmas present.  Kids and adults loved them.  Also, the expanding speaker really works.  The sound comes through "loud and proud".  The quality of these was far greater than I expected, and well worth what I paid for them.  Keep in mind, they both run on the same frequency, so one controller will activate both machines.  But hey, why not "stereo"?  If you are looking for a high quality fart machine, look no further.  I will be getting a set of these for myself in the near future.
Rating: 5 stars