Device s - small
Screen width less than 319px.
Device m - mobile
Screen width between 320px to 767px.
Device sm - small & mobile
Screen width less than 767px.
Device tb - tablet
Screen width between 768px to 991px.
Device pc - normal screen of computer or notebook
Screen width between 992px to 1199px.
Device hd - HD screen of computer or notebook
Screen width more than 1200px.
Very simple to make CSS media query.
Very simple to make RWD container.
Very simple to show and hide with RWD.
Very simple to use RWD container.
Visit Github for more information.