How use that?

I found ebay one toy, but not understant how to use.

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easy attach smaller one to cock near the head larger one goes around leg tighten cords

thank you, This can put own leg or somebody else leg. Maybe very fun is some party.

I would be nervous about this device, for extended wear.
There's a story from "1,000 ways to die" (TV show) where a guy tried to use surgical tubing to hold a cucumber in place while he danced, in the 70s or so...
Got a ***** clot and died on the dance floor.

I'd guess short-term isn't an issue, but if you're looking for enlargement? The tourniquet effect (like the surgical tubing) might be fatal, and the chastity angle? Not likely to work, either.