It arrived in its carry-case with a set of Japanese instructions; thankfully it's pretty intuitive to use. It offers 6 stages of light intensity, image rotation (very handy when you get into those tight, hidden corners), and is guaranteed to IP67 water resistance standards.
The image quality of the 2.36" (6cm) LCD screen is fine though a very bright light shining up on it renders it nearly invisible. That's not usually an issue in the typical garage/workshop environment - indeed, the only bright (and spotless) such place I ever encountered was the then McLaren Mercedes F1 facility in Woking, England. My usual motorcycle workshop hardly ran to a series of 60W bulbs...
Anyway, digressions aside, this does what you would expect of it - that's about it. It only cost me £12 and I'm fine with that.
There have been a few times where these could have been extremely useful, and while searching in recent years for endoscopes when they would have been digital instead of only optical, they've been way too overpriced to be a sensible option for small projects. I'd say this was a major bargain and well worth £12.