Evaliana Unisex Turkey Hat Light-Up Drumsticks Cap Christmas Costume Thanksgiving

We just received our hat today. How do you turn the lights on? We found as item inside the hat, but can't seem to turn them on.

Are the hats removable?

Whats the name/number of the type of batteries it takes? Want to order them now so they arrive b4 thanksgiving... Thanks!

Are the batteries replaceable?