The days of guessing who is knocking on your door are over. There are plenty of sophisticated solutions for you to figure out exactly who is behind your door. The iDoorCam is quite special though. It is a Wi-Fi enabled webcam doorbell that lets you see, hear, and talk to visitors from your mobile devices.
iDoorCam has an infrared camera with motion sensor, LED indicator, and microphone. It is small and lightweight (can be installed fast). It will set you back $137 though.