Škoda DuoBell: A bicycle bell that penetrates noise-cancelling headphones (skoda-storyboard.com)

Škoda, working with scientists at the University of Salford, has developed the DuoBell, a mechanical bicycle bell designed to be audible even to pedestrians wearing active noise-cancelling headphones. Research identified a “safety gap” frequency (750–780 Hz) and a resonator/striking mechanism intended to disrupt ANC suppression. Testing reported that it increased pedestrians’ reaction distance by up to 22 metres, and London trials reportedly drew positive feedback from couriers.