I have scubapro extender watch but it didn`t have NO FLY howw can i know that and how i can do nitrox with it.

Answers:

Is it true that all human beings can swim, and that is just a matter of panic that is why we drown.?

I'm not sure what model watch you have. The best thing would be to take it to a local dive shop and see what they have to say. I do know that in order to use a computer with Nitrox your computer has to have Nitrox settings. If your computer doesn't have Nitrox settings you will have to buy what that does. In order to breath Nitrox you will have to take a class first you can ask about that at the dive shop as well.

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Ok but what do you do when he comes to your house and ask you to go back with him and you say no and he cries?

Simple - R.T.F.M.

The extender is a new model which hasn't been released in the US. Since it is the latest technology I would be VERY surprised to find it doesnt have a "time to fly" function. If it doesn't, then just don't fly for 24 hours since your last dive - easy.
It is Nitrox compatible, up to 99% mix even, hopefully that means it will support 2 or 3 gas switching.

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