A single-chamber auto/manual life jacket is a personal flotation device designed to keep individuals afloat in water. With one inflatable air chamber, this type of life jacket can automatically inflate upon contact with water through a water-sensitive element, swiftly providing buoyancy. In the event of an automatic system failure or user preference, the life jacket offers a manual inflation option. This process involves pulling a cord attached to a CO2 cartridge, which releases gas into the inflatable chamber, offering vital buoyancy. Ideal for various water activities like boating and kayaking, these life jackets ensure safety, even if the wearer is unconscious. Proper fit, regular maintenance, and adherence to manufacturer guidelines are essential to ensure the reliable functionality of these life-saving devices.