Air Horn With Mini Pump

Samui Corporation, Canada brand.
Up to 115db. 
No need to buy refills. No vapours or chemicals.
Has a robust aluminium canister.
Refillable with any source of compressed air - garage, bicycle pump or compressor. Applications: Sports events, marine safety, camping, hunting, construction & industrial sites etc.
To refill lift the red operating lever to expose the standard car valve.  Refill to 80psi (5.5bar). Maximum pressure 100psi (7bar).