Changing the device width?

What a user-friendly plugin you’ve created! One thing that I hoping to do with it is to specify a width (e.g.: max-width: 496px) so that certain small devices will still see the non-mobile (desktop) version, while the screens under 496px will see the mobile version.

I’m not using separate sites for desktop and mobile, just a different page. I.e.:
desktop: http://mywebsite.com
mobile: http://mywebsite.com/m

Your thoughts?

https://ww.wp.xz.cn/plugins/simple-mobile-url-redirect/