Let those Cell Phone talking, Stereo listening Airheads know you are there! This is the worlds loudest bike horn at 115 db and the sound of a Semi's air horns. A blast from this little baby will get their attention. So loud that it is even US Coast Guard Approved as a Fog Horn for boats. Easy to install and Easy to move from bike to bike. No refill cartridges to buy just fill it up with any air pump or compressor. $24.00 shipped anywhere in the US for motor-bike.com members. Just shoot me a PM or an email if you want one. PayPal, Visa, Mastercard and Postal MO will all work fine.