How old fashion it is to unlock your door using your keys? Not only is it old-fashioned, the repeated jingling of the keys as you fumble for the right key is just plain annoying. What you need is a new and innovative way of opening your door without having to spend on a top-notch security system.
This project features an awesome gadget that you can easily make that allows you to unlock your door by knocking a secret code you made yourself.
Continue to the Next Page to watch this amazing video: Unlock Your Door With A Knock!