The Fox 40 Marine EcoBlast Air Horn by will receive attention with powerful 120 dB sound can be heard up to one mile away.  Once this air horn runs out, and it will, you can recharge it using the pump included. Once charged you can get up to 50 half-second blasts per 80 PSI charge.

• Includes Mini Air Pump for air horn to be refilled quickly and conveniently
• The EcoBlast™ rechargeable safety signal air horn can also be filled by any bicycle pump, air compressor or local service station
• Environmentally friendly - 100% ozone safe!
• Powerful 120 dB sound meets National Coast Guard regulations
• Can be heard up to one mile (1.6 km) away
• Up to 50 half-second blasts per 80 psi charge
• Can be stored indoors or outdoors
• Non-corrosive and non-toxic
• No chemicals 
• Made of lightweight aluminum and strong ABS plastic