The Lockitron is one of the best wifi enabled smart door locks on the market right now. Currently available for preorder for $179, and shipping in the fall, Lockitron is a fully portable and transferable deadbolt automation system that replaces your standard house key with your cell phone. With it, you can grant family and friends access to your home without having to give up a spare key, and you can easily revoke access at a moments notice. Phones with bluetooth 4.0 can simply walk up to the door and the Lockitron will automatically unlock when in range, and lock when the phone is away from the door. It even has a knock sensor and will send you a message when someone knocks on your door. Preorder yours today!