The icon is a simplified prescription of two devices, a smaller smartphone and a larger tablet. Both devices are rounded rectangles with angular rectangle screens taking up most of the surface, with "home" buttons below them. The smartphone overlaps the tablet slightly on the lower right corner.
Related to Smartphone Tablet Icon
Related icons are the icons with matching tags, as well as all mobile icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors