"Came to me in the mail today, tried Googling the name but I’m only getting results for medical devices. It’s quite heavy and appears to be pretty used, also has some sort of spanner like object. Also my name and address were on the box but I didn’t order it, so could it be some sort of scam?"
A: "The spanner thing is a torque wrench. Mainly to tighten bolts or nuts to a certain poundage."
We used to make these as kids by taping a cut off balloon to a broad piece of pvc pipe. They can shoot things away really hard. Funny to see a commercially made one. I bet you can easily take someone's eye out with those metal balls.