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PFD's, the Sospenders brand can be used both manually and on automatic. When you insert the CO2 cartridge just don't add the lifesaver candy size O ring where it is placed. Then you just rely on the pull cord. One thing about the automatic function..........if you get conked on the head and become unconcious or semi-concious you will rise to the surface. I think the time frame is only a few seconds. An email to the company will settle any question time wise.
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