Dunlop LED Bicycle Bell 175348 Properties: The Dunlop bicycle bell with LED light will increase safety on your next bike ride. The model has a waterproof construction that is resistant to damage. Easy attachment. Technical data: dimensions: 6.5 x 4.5 x 6 cm bell dimensions: 4.5 x 3.5 (diameter x height) mounting diameter: approx. 21 - 22.5 mm material: plastic, aluminum batteries: yes 2 x CR2032 two light functions: pulsating red and constant, smoothly changing colors