Inflatable lifejackets have an inflation valve connected to an airtight lung. The inflation starts automatically about three seconds after immersion. All our lifejackets with automatic inflation also have a manual inflation backup and a mouth valve. The propellant in our gas cartridges is harmless carbon dioxide. NOTE! After the life jacket has been gas inflated, it must be recharged. In the vest there is a marking on which recharging kit to use.