"Saxxy is a voice-controlled synthesizer shaped like a mini sax, I guess.
You sing/hum/scream into the mic at one end and Saxxy spits out tuba, clarinet, or sax sounds that track the pitch of your voice. You can also shift any of the sounds 2 octaves up or down.
This is a surprisingly fun little device that can actually sound quite cool, and it's great as a non-keyboard approach to sound generation. The tuba sound pitched down an octave does some cool bass too.
Takes 4 AA batteries and has a 1/8" headphone output."