“I was helping my boss move desks and I found this thing. No screens, markings, or ports, just the switch on the side. It vibrates when switched on. My coworker and I are at a loss.”
Answer: "This drops into a soft side neck or back massager. Turn it on, drop into fabric holder, and place the holder around the neck."
Could it be the picture is upside-down?
"Tastes like lime..." I'm more concerned that the person would taste something that they don't know what it is (the answer is probably correct but still...)