Dunlop bike bell LED 175348 The bike bell with LED light from Dunlop will increase safety during your next bike trip. The model has a waterproof design that re is resistant to damage. Easy mounting.  Technical data:· dimensions: 6.5 x 4.5 x 6 cm· bell dimensions: 4, 5 x 3.5 ( dia. x height)· diameter for assembly: approx. 21 - 22.5 mm· material: plastic plastic, aluminum· batteries: yes 2 x CR2032 · two light functions: pulsating red and constant smoothly changing colors