Did you change your front-door lock set when you moved in? “Not only could the past owner still have copies of the key, but so could his friends or your neighbors,” he says.

But Kwikset is updating its Kevo Bluetooth front door lock with new hardware that lets you lock or unlock your front door from anywhere on earth you have mobile data on your smartphone.

What separates these brainiacs from your standard front door lock is an added layer of tech, typically Bluetooth, Z-Wave or Wi-Fi -- or some combination of the three.