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Bigeon whistle is inspired by a Chinese traditional toy, the "pigeon whistle".
When the users riding the bike, air flows into the cavity and the bigeon whistle can make a pleasant sound and release perfumed air.
With it, Users can enjoy the additional auditive and olfactory experience when riding bike.
Bigeon whistle always alter the tone and volume of the whistle with the change of air flowing speed, so it can help to build the perceptual knowledge of the speed of bike.
Bigeon whistle also can warn passers-by to avoid the bike.