I was listening to a podcast and they did a good ad from Ring.com. I just had to go online and look at it. And what do you know it was all that cool.
It is a standalone one-way video two-way audio doorbell that lets you answer any ring or motion outside with voice. It also records the motion and rings for you to look at later.
Look at these videos:
The doorbell comes in a nice box with all the tools you need.
You do not have to plug it in to power as the built in battery will last a long time and you can charge it with a standard USB cable.
You do not need to buy extra chimes as one chime unit comes in the box, but here make sure that you specify an international package. I did not know that the orginal box came with a chime unit so I ordered that aswell.