This extinguisher uses a water-based, non-toxic extinguishing formula delivered via a pressurised aerosol-style canister. Typically available in sizes around 500 to 600 ml, it is designed to tackle multiple fire classes including A, B, C, and electrical fires up to approximately 1000V. The unit provides a controlled spray duration of around 10 to 15 seconds and requires no pressure gauge, with a simple push-button activation system. Compact extinguishers of this type are specifically designed for portability and ease of use in confined environments such as caravans.