Can you Disable a plugin on Mobile Devices with Code?

I have this plugin called “WP FLOAT”, I want to disable it when it detects a small screen size, lets say smaller than 400px. Is there a line of PHP code I can paste in one of the plugin’s files to make this happen?

These are the only files for the plugin:

wp-float/wp-float(.)php

wp-float/readme(.)txt

wp-float/js/jquery.hoverIntent.minified(.)js

wp-float/js/jquery.easing(.)js

wp-float/js/wp-float-button(.)js

wp-float/js/jquery.floater.2.2(.)js

wp-float/js/button-wpfloat(.)php

What would I paste and in which file? Thanks