But you could imagine a Bluetooth HomeKit door lock on your front door, right. >> And now I happen to be upstairs in the bedroom and I want to unlock my front door because my kid has come home late. Somebody's come, the dog walkers come, whatever it is, and I want to open the front door.Ooh, but wait, guess what. The bedroom and the front door are too far apart. They can't talk to each other.>> Yeah. >> And now the question is, how do I solve that. Well, I can move closer to the door lock.>> But then I may ...