This is a blue Otamatone, a Japanese electronic musical instrument. The instrument is shaped like an eighth note with a long stem and a round head. Users slide their fingers along the stem's touch-sensitive surface to vary the pitch. Squeezing the "cheeks" of the head opens and closes the mouth to create a vibrato effect. It features an octave selector switch with low, medium, and high range settings. It is a popular, fun, and easy-to-play portable synthesizer toy. In a used condition. Tested and working
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