Meet the DoorBird: a smart video doorbell that works with your smartphone to enable you to answer your door from anywhere. You will get an alert on your smartphone as soon as you have a visitor. Since the system has a motion sensor, your visitors don’t even have to push the button for you to monitor them. The DoorBird can connect to the Internet via WiFi or an Ethernet cable.
It can pair with up to 8 devices. You get a high quality camera with night vision and a weather resistant design. The system also provides you with visitor history with image, date, and time. The DoorBird is compatible with iOS and Android devices. You can get one for as low as $299 if you order early.[Source]