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Yes S4ty is right we can use this.

This will be a great help for Application devlopers to inform the End-User if there browsers are not compatible.

That kind of seems to defeat the whole purpose of responsive web design if you're using the device grade to tell users that their browsers aren't compatible.  That's the whole idea behind the graded support is that you should still get a usable experience on less capable platforms instead of just telling a user "Sorry, you can't use this site."

IMO, if you have to detect the browser grade in order to display that type of a message to the user you probably haven't really embraced true responsive web design.

I never mentioned for telling a user "Sorry, you can't use this site."

I am looking for some new way. I have tried this before on other project.