The worlds loudest bike horn, but dont take our word for it; see what a passionate user said about it:A big problem on the bike (especially when commuting or cycling in rush hour) is being cut up, being pulled out on or overtaken too closely. The Air Zound is a fantastic & immensely loud bicycle horn. Bin that pathetic bell now & get one of these 115 decibel, rechargeable air horns. Requiring no batteries, no cartridges & refilling with a simple bike pump, the Air Zound will definitely make sure you are seen & heard on your city commute