The Super Blast Hand Pump Air Horn is a great item to add to your emergency kit, earthquake preparedness kit, camping and hiking supplies or for use at just about any sports event that you may attend or referee. It is non aerosol which makes it environmentally safe and eco friendly. To install the horn just screw it onto the pump. This air horn produces 110 decibles and meets U.S. Coast Guard requirements for boats up to 65ft. The horn is 7.5in long and the pump is 5.5in long.