Really easy to use and comes with a fork that allows you to make the length of extension cord you want in just a minute or two. Makes installing the Christmas lights easier and looks much more professional. A bit pricey but worth it considering what it allows me to do. There are several built-in ones, I'll try that too. It would help if they made a pack with the female and male ends together. Also no instructions, just google "how to use vampire fork or gilbert fork" and you will understand everything. No electrical skills required.