At 140d B its equivalent to a jet engine & 4 x louder than the competition. Now cyclists can actively alert lorries buses cars & pedestrians to their presence (rather than hoping to be seen) which makes cycling safer.• Piercing 140 decibel sound•2 modes including quieter Park mode• Versatile design fits ALL styles of bike• Rubber trigger stretches round ALL handlebars• Thumb rests comfortably on trigger• Safe & easy to operate even when braking• Easy to install•IP44 (splash proof)•2x AAA batteries included• Only 96g (inc batteries)