This is a cute dispenser designed exclusively for use with Post-it Pop-up Notes, the kind that are connected zig-zag style (below, I've shared a tip for using it with other stickies). The bottom portion of the dispenser is a dark purplish-pink. It's heavily weighted so that there's no need to hold it while pulling out a sticky note. In the center interior of the base there is a spring, covered with plastic, that pushes up on the pad. The paper pad is housed in tabs in the medium-pink-colored top. The two portions snap together and come apart easily for sticky pad refills.
This dispenser works fine for me with off-label sticky notes, though you can't do this without a time-consuming modification. To use generic stickies or adapt a normal Post-it stack, choose a stack that measures approximately 3" x 3". The height of the stack is not important since sheets can be saved for later if it's too tall. Separate the stickies one by one, and reattach them to one another accordion style. Then, load them into the dispenser as directed.
The heft of this product is impressive; even though it's plastic it feels sturdy, and it sits still when sheets are removed, so that it does the work of one hand (holding the pad). The only negative I can think to say about it is that it does take up a lot more space than simply having a Post-it pad sitting on your desk.