Meet the Chatrbell: a smart door bell that pairs with your smartphone to let you answer your door more conveniently. It has a built-in chat system, allowing you to chat live with people knocking on your door. It has a smart module you stick on the inside of your door. Using this solution, you can avoid opening the door when you don’t want or keep people from waking up your family when they are resting.
The above video shows the Chatrbell doorbell in action. This smart door bell works with smartphones and smartwatches. You can find out more on Kickstarter.