No strings but apparently they have capacitive touch sensors on the surface. One reviewer describes the "freestyle" mode:
"there's a usable fret board in so-called open E tuning, letting you select actual cords by placing a finger on its respective fret up or down the printed-on fret board. One finger does major, two fingers does minor, and three fingers does a 7th."
Also:
"The amp uses a sonic transducer to vibrate its entire, cheap cardboard mass, and is actually rather loud."
This is the sort of thing that, 15 years from now, will be uploaded on this site and be made fun of by the site-goers who will be our ages at the time.