Automatically inflates upon immersion in water or when the wearer pulls the "Jerk to Inflate" handle Equipped with back-up oral inflation Convertible from AUTO/MANUAL inflation to MANUAL ONLY inflation Provides comfort, safety and peace of mind without knowing you have it on ...Automatically inflates upon immersion in water or when the wearer pulls the "Jerk to Inflate" handle Equipped with back-up oral inflation Convertible from AUTO/MANUAL inflation to MANUAL ONLY inflation Provides comfort, safety and peace of mind without knowing you have it on, until you may need it Comfortable, lightweight, low profile design Soft neoprene neckline for all day comfort Durable fabric resists tears and punctures For persons 16 years of age and older; and over 36kg. Not recommended for non-swimmers or weak swimmers Minimum buoyancy of 36kg. when inflated For replacement CO2 cartridge, use Onyx A/M-24 Rearming Kit #1352 (K320) U.S.