For those of you who don't realize, the manufacturer can set the warning buzzes to any time you wish. I see there are three models now with standard timing warnings. Make sure you get the right one for the level you are working.
As for using it, it is great. You don't have to worry about looking at a watch all the time to see when to give the warning signal. Just press a button and wait until that thing starts attacking your belt. It is very obvious to you when it goes off but nobody else knows it is going off.
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