$0.00
Inside the ball is a speaker. When the switch is toggled, the speaker will emit a constant frequency. Spin the ball around your head and hear as the observed frequency changes.
(3B40.10) Doppler Ball
$0.00
Inside the ball is a speaker. When the switch is toggled, the speaker will emit a constant frequency. Spin the ball around your head and hear as the observed frequency changes.
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