Inexpensive & portable method of alerting people in the vicinity of danger. Ideal for safety cover during fire alarm system installation & maintenance and for temporary installations such as construction sites, exhibitions & events. Non- Flammable, dry gas technology (no danger of liquids squirting out) is HFC-free, cannot be used for solvent abuse and does not freeze when activated. Long, loud sound duration – 112dB output. Emergency gas horn, ideal for fire wardens. Perfect for fire drills. Ideal for providing temporary cover during alarms installations and for construction site applications. 200ml can for multiple uses. Acoustic range of approximately 1500 metres. Non-flammable gas. Refill canisters available