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I didnt need to use it, but when I tried it, it worked well and it didnt flood. The strobe is a great safety device that every diver hould have and this one even doubles as a small flash light.
I purchased two of these light sticks, one worked great and shuts off when you unscrew the cap some, but the other remains on once the batteries are in place. Ill be asking for a replacement. They are visible and it seems they would last for several dives.