This gas horn has an aerosol that is free of hydro fluorocarbon gases. Use of aerosols containing these gases has been terminated by EU 517-2014 due to the Global Warming Potential (GWP). Gas horns provide a brilliant form of temporary alarm cover and are therefore often used on construction sites etc. Check compliance on our blog. Ideal for providing temporary cover furing alarm installations and for construction site applications 150ml Can to give multiple uses Environmentally friendly gas – complies with EU517/2014 Loud, long sound duration (110dB) output Acoustic range of approximately 1500m Re-designed horn uses less gas meaning more us out of each can Single, non-flammable gas propellant Refill canisters availbale