New Technology for Door locks - Knock Code

It was really interesting to read this article on Knock code Technology developed by an Israeli company called E-Lock. You dont have to have keyholes in your doors anymore. Knock code can unlock your door with the knocking pattern of the door. The knocking pattern is built into a device which works only when you provide your authorization code. Also you cannot determine the sequence since the sequence of the knock pattern changes every other second. Pretty cool huh ?