In the words of Line 6:

Supercharge your pedal board with a single stompbox! M5 Stompbox Modeler delivers 100+ incredible effects, one at a time – just like the originals. Get gain-defying distortions, lush choruses, scintillating reverbs and other expressive effects in a single-pedal-size stompbox. Step through your favorite 24 presets on the fly.