New smart home doorbell for Arduino

I’ve found an interesting doorbell system.
The company is from Germany and also does everything made in Germany.

Here’s the link:

It is currently in the financing phase on and is availiable for 99€ (-45% off).

Here’s the link to the campaign:

The system works without WiFi and doesn’t need batteries, pretty cool.
I really like the Voting-Mode.

Today they released a developers update. It seems that it will be compatible with Arduino.
I am currently thinking about backing it.