There are two kinds of bicycle bells: mechanical and electrical. The mechanical type is more inconvenient to operate when a long alarm sound is needed. The structure of the electrical bell is complex, and the battery is not environmentally friendly.

Bellpipes harnesses the wind to create sound. Through the wind tunnel effect, it can make sound without consuming any electrical power. The speed of the bike makes the wind blow the whistle and sound the alarm. When the cyclist needs to make a long alarm sound, they can switch from the ‘wind bell’ mode to the ‘whistle’ mode.

At the base of the Bellpipes is a revolving axle at 90 degrees. It can shut off the whistling while maintaining the bell function. The sound is emitted from the plastic body, which is manufactured with 3D printing.

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