This, ladies and gentleman, is the Mega Man 2 Tiger Electronics LCD Wristwatch. It is one of, if not the rarest incarnation of Mega Man 2. And while it is by no means a perfect representation of the NES classic, its novelty alone - the mere fact that something like this exists - makes it a treasure.
The D-Pads' Rick snagged the watch for a staggering $400 off of eBay. After a heated internal conflict, Rick decided take it out of its original, ageing packaging and record a good 40-minutes worth of gameplay. It's one of the most unique, obscure "Let's Plays" I've ever encountered.
Also, I should mention that there are early talks about disassembling the watch for preservation and emulation. So yeah; you may yet have the chance to play it!