Holder for a common, 50 x 70mm, printed circuit board. Includes support for suction-cup feet (great for a show-n-tell ;-) as well as 4mm drill-holes for a more secure / long term mounting strategy.
(p.s: You've no idea how difficult it is to keep from describing this 'thang as being 'a cute little sucker' ... but I will prevail!)
Designed for tabletop display, you'll want to screw / glue / tape your board to the display if your needs are other than purely horizontal. Including a vertical for a non-porous 'fridge / window / pegboard (etc) display, as well.