You just sort of reach inside and take it.
You have no idea what this thing is supposed to do. It's some particularly arcane loot your grandma pinched on one of her daring expeditions. You've been told it's important. Probably for puzzles later or something. Like something from one of the National Treasure movies, that Nic Cage finds in the old lair of a secret president, and he doesn't know why it's important, he just shoves it in his hero satchel and keeps doing adventures until it randomly becomes important.
You hope it's not a problem that you made it so small. Wait, that's exactly the kind of thing a hero doesn't worry about. Cage would just pocket his tiny window thingamabob and keep being awesome. Shit like that is for the plot to figure out, not the brave gun toting hero.
Looks like the shades are bugging you again. Why are you not surprised?