Metal pull pin with a safety seal to help prevent accidental discharge and tampering; corrosion-resistant, easy-to-read, color-coded metal gauge; waterproof label with easy instructions. Coast Guard-approved for marine use. First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert brand trust survey in February 2018).
It can be recharged by a certified professional after use, allowing for reuse.