It's always nice to have a bottle opener with you at all times, and if that key were to say, open the door to your house, odds are you will have it on you at all times. The KeyMe Bottle opener key is a key that will open your door, and also open your bottles of beer, as it is a key with a built in bottle opener. The way it works is you have to download the KeyMe iPhone app, take a picture of current key, and order it via the app, then KeyMe will then send you a new KeyMe bottle opener key in the mail that will open your door. The KeyMe Bottle Opener key will work with most common locks, and will fit right onto your keychain.