Ever thought of a way to auto lock or auto unlock doors, when you walk? Ever thought a mobile can help you to lock your door, without internet? August Lock is here – http://august.com/
Priced at around $250, this lock can be controlled with bluetooth, with an app in Android or iOS mobile phone. Yes!! an app can lock or unlock your door. Just pair it up with your phone. Send invites to others whom you want to unlock the door for. Plus you can always open door with a key.
See review on cnet (http://www.cnet.com/products/august-smart-lock/)