Okay, so it’s not a toaster. Which is fine. But it will test your 10Base-T and 100Base-T networking cables and tell you if you have any serious issues that would make your network, um, not work. I hate troubleshooting my connection to the Internet and discovering that a bum network cable is at fault. Especially after a hair-tearing two hours.
Of course, you could always just try plugging in a different network cable, but then you wouldn’t have this cool box with flashy lights on it!