What do you have in your hands?

We all have something in our hands that is meant to serve us. We may have trouble recognizing what that thing is because we do it so effortlessly and don't consider it as something of great value. The thing in your hand may not be of great value in someone else's incapable hands but in yours it is priceless.
What do you have that serves you regularly, and has remained one of your best kept secrets? Pull it out, give it a second look. You'll be surprised at what you had all along.