These handsome little pieces are liquid filled old fashioned style brass compasses, with glow in the dark paint on the hand and rim. They'll look cool and handy, and be marginally useful if you manage to get lost. Plus they look cool.
In addition to these designs, most any pocket watch design can be etched on a compass too, so just let me know which one you'd prefer!
Compasses don't have a locking mechanism, there's a small offset in the lid that can be used to lift it open.