The KnocKey has been around for a while, but I have not seen anything like it. You can either mount the device on the door or carry it with you. All you have to do is enter a code, hold it up to the door and it will rap out a code. The lock that is installed in the door will only open to the correct knocking sequence.
With nothing like a key hole on the outside of the door, there is nothing to pick, and the billions of possible codes eliminate the chance of someone cracking your code. Use different codes for different doors, or one for all. The remotes are all the same, so if you lose yours, just purchase another and punch your code in. Made by E-Lock in Israel.
