Rechargeable safety signal air horn can be refilled quickly and conveniently with any bicycle pump, air compressor or at a local service station. Powerful 120 dB sound meets National Coast Guard regulations. Can be heard up to a mile away. Up to 50 half-second blasts per 80 psi charge. Environmentally friendly, 100% ozone safe! Non-corrosive and non-toxic. Can be used in all weather conditions. Includes high pressure mini pump.