Our HalGuard® PRO car fire extinguishers contain Halon 1211, a "clean" extinguishing agent that rapidly turns into a gas without leaving a messy residue. Halon 1211 is the most effective clean agent available today—twice as powerful as the standard Halotron® 1 HalGuard® units. Like all of our extinguishers, these are UL-listed, fully rechargeable, and backed by a 6-year warranty.