Never buy another air horn, this one recharges with air! 

• Safe for the environment - uses AIR only, no harmful gas.
• Never have to buy a refill cannister.
• Recharges via a recessed valve in the base of the horn.
• Easily refills with the mini air pump included in the kit, any bicycle pump, air compressor or tyre pump at your local service station.
• Horn has a plastic base cover to prevent any rust rings on surfaces.
• Powerful 115 decibel blast.
• Can be safely stored - no harmful or dangerous gas
• Operates in all weather and temperature extremes