Oh god, that noise
This toy has a reasonably sturdy pole, an elastic cord, and a cute little plush mouse. The slightest movement causes it to make a shrill EE-EE-EE-EE-EE noise. You cannot turn this off.
My two cats love it - they get very excited by the squeaking and it's a definite improvement over silent toys. It is currently wrapped in a scrap of furry fabric and stuffed into the cat-toy-drawer. It goes off when I walk past.
Buy it if you hate peace, quiet, and the people you live with.