Has to do with a screw?

What is this blue thing?

Apparently it has to do with cable because obviously it says that right on the tool. I'm still uncertain of what this particular tool is for or even what it is called?

The right end of it has a speaker on it?

You use this tool with your hands

You wear it on your head

Wooden Tools

Believe it or not these are tools.

This should be an easy one