I'm only responsible for what I say, not for what you understand. Although as an author I am responsible for making readers understand--a reader who doesn't understand is an unhappy reader. (And there is some value to leaving some questions unanswered.
Key holders are an essential feature in your home if you tend to lose your keys. Many of us have lost our keys a number of times, if only we had a place to put them once we got home, this is where Key Holders come in.