This is the Otamatone from Maywa Denki, not to be confused with the Jumbo or the Deluxe versions:
These delightful ‘singing’ creatures/instruments were developed in Japan by the Cube Works Company along with Maywa Denki and Novmichi Tosa, who is demonstrating in these videos. Otomatones are known to be the “world’s cutest and weirdest musical instrument”. This appears to be true.
Otamatones of all sizes and colors can be found on Amazon. This one is a bestseller.
via io9.
This award-winning video collection is reader-supported. Become a sustaining member to keep TKSST online and free for everyone, including teachers and parents who use it as a resource to spark learning and curiosity for kids.