Well, it's not often I review something BEFORE I buy it, but there are still 4 days to Christmas, so perhaps I can help you with your last minute shopping. Today I saw a dude with an \"antenna\" on his BCD. I asked him what it was, as I know we still can't get GPS underwater (damn!), and he showed me this nifty little device. It is long(ish), but he did not struggle with it, and the rattle sound is loud and clear. Having the advantage of being able to point out your object of attention without being nipped is a huge advantage when you're diving with a variety of poisonous sea critters as we do in PNG! It was also easier to point out something when there's a current, where remaining in one place is a bit challenging, and it's more effective than a finger. Finally, unless you accidentally stab the poor beastie, it's also less invasive than a laser. And, in case you're wondering, yes, I'm taking advantage of my 4 shopping days to Christmas! :) Edit Jan 02: this must-have gadget is also useful for tank banging and allowed our group to enjoy a Wobbegong Shark resting on the reef. Love it!