The first automatic Personal Floatation Device (PFD) programmable in four modes.
Inflates immediately upon immersion. Immune to wave splashes, heavy rain, and high humidity. While a wet environment will not set it off, simply immersing into the water will.
Vest inflates upon immersion but only after the trigger time is exceeded. Getting out of the water resets the delay. It provides operators time to escape a sinking aircraft or an overturned boat. Avoiding that early inflation that might trap them.
PSLV inflates only when the users self-set time and/or depth triggers are exceeded. (For example staying down too long or going too deep will fire the vest).
Depth trigger only; valuable when the operator is faced with a rapid sink rate, which can accelerate as he descends into deep water. Even though the time trigger has not been met, exceeding the depth limit will cause inflation. Useful in shallow-water tactical rebreather operations.