A double-chamber auto/manual life jacket is an advanced type of personal flotation device (PFD) designed to provide enhanced safety and buoyancy in water-related activities. Unlike single-chamber life jackets, it features two separate inflatable air chambers, providing redundancy and increased buoyancy in case of chamber failure. The life jacket operates in both auto and manual modes.

Auto Inflation: In the auto mode, the life jacket's inflation system is triggered when it comes into contact with water. A water-sensitive element activates the inflation mechanism, rapidly inflating both air chambers to keep the wearer afloat.

The life jacket also includes a manual inflation option, allowing the wearer to inflate the chambers manually by pulling a cord connected to CO2 cartridges. This manual backup ensures inflation in case the automatic system malfunctions or if the wearer prefers manual control.

Double-chamber life jackets are commonly used in water sports, sailing, and other activities where added safety is crucial. It is essential to regularly inspect and maintain the life jacket, including checking the CO2 cartridges, to ensure it remains fully functional when needed most. Always follow the manufacturer's instructions for proper usage and care of the life jacket to ensure optimal performance and safety.