Noise-canceling headphones can’t block out this genius bike bell

A carmaker found just the right frequency for a bike bell to make it past a headphone’s noise-canceling algorithm.

Pedestrians wearing headphones who are unaware of their surroundings pose an accident risk for cyclists—especially if those pedestrians are blasting their favorite tunes in noise-canceling headphones that block out the rest of the world. A new bike bell is designed to pierce that bubble.

Škoda, a Czech automaker, calls its new DuoBell an analog solution to a digital problem. It’s a mechanical bell, but the company says its the first........

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