I guess I skipped over the size and reviews before I purchased (Woops!). As many reviewers have mentioned, as I read them now, this mirror is the size of your palm. You also need it to be an inch or two from your face to see clearly. Great for eyebrows, but definitely not for makeup as you can't see your whole face at once. Runs on 4 CR2032 batteries, which it comes with. You need to unscrew the back to change them.