ok I have used mine several times now and after you have it on a few minutes you forget you have it on. good investment. I read that it will have to be under water a few inches to deploy, works on the water pressure not just getting wet. but in reality there is no way to know if it will work when you need it. the indicator light shows it is armed but if you test it out then you start all over for about another 15-20$ and you are not 100% sure it will repeat. my biggest concern is I drop in or fall getting in or out of the kayak in 6" and its spent.