We've seen this clever remover used in high-volume office operations where many stacks of paper need to be unstapled and fed into a high speed scanner.
All you do is pry the staple up, as shown in the diagram on the packaging, and lift it out. For really tough staples, you can first use the tool to bend up the prongs on the bottom of the stack, then pry the staple out from the top.
If you've ever used one of those classic "fang"-type staple removers, you know how time-consuming and clumsy they are. So, if you have staples to remove, this is an inexpensive, simple way to further reduce unnecesary friction in your life.