The Ecoblast rechargeable air horn may be used for raising an alarm in the event of an emergency evacuation. 

Features:

• Emits a powerful 115dB signal
• Refill valve allows recharge using the included mini air pump, bicycle air pump or air compressor
• Refills via a recessed valve in the base of the horn
• Aluminium alloy body
• Safe for the environment – no harmful or dangerous gas
• Can be safely stored - no harmful or dangerous gas - Just AIR
• Operates in all weather and temperature extremes
• Also available as a kit with mini air pump