140 decibels is the equivalent sound of a jet engine and is 4 times louder than the nearest competitor. You can alert drivers of cars, buses, lorries & pedestrians to your presence. It has two sounds - a piercing 'road' mode (140dB) and a lower pitched car horn sound (121dB) for cycle paths. The remote trigger means it is safe and easy to use when braking, while being easy to install and remove thanks to the Garmin style mount, the dB140 fits all bicycles. Completely weatherproof (although not submersible), the dB140 is a potentially life-saving accessory when riding in towns and cities.