These are great little lights for the kitchen. I have a small galley kitchen with 1 light over the faucet I like to leave on at night.  But these allow me to turn that light off at night and use these motion sensing lights. You dont have to be right up on them for them to turn on. So just walking by them usually works. They are round and a nice size. Not too big. Not too small. They fit perfectly under my cabinets but would also work other places as well. They require 3 double a batteries each. I use reusable batteries in mine.  They come with screws or an adhesive circle. I used the adhesive circle and it works fine.  The back plate just turns and comes off to install batteries. Super easy to install and put up. No instructions needed. Comes with 3 lights in a pack.  Great product.