Otamatone Sound Toy / Musical Instrument
I’m not entirely sure how to classify the Otamatone, it’s kind of a cross between a musical toy, an actual instrument and a theremin. “Waaaah”-like sounds are produced by squeezing the ‘face’ at the bottom while sliding one’s fingers up and down the ‘neck’.
The Otamatone was created by Maywa Denki, whose website is even more confusing than this device, but since it was shown at the 2009 Tokyo Toy Show I have to assume it will actually be available for sale in Japan at some point.