NetatmoNWS01-US Aluminium Weather Station (AAA, Aluminium)

Q: Power source? I see people talking about power failures and batteries gone bad. The info does say. How are these units powered?

The inside unit is powered over USB using a 110 AC adapter. The outside unit uses AAA batteries. I've had both units running over 45 days w/o any issues. The outside unit still shows 100% battery life. I'm very satisfied with both units.

Q: Is this device suitable for monitoring your home's inside temperature when traveling overseas for 2 months?

If that's your main need, you might consider the Nest thermostat. It installs very easily, and from your phone or computer, anywhere, you can monitor your indoor temperature, and the turn on the air or heat, and put them on a schedule if you want, or of course, set it for minimums and maximums. It's very well designed and simple, for around $200, I believe.

Q: Is it included a 230 v adapter ?

Adaptor says 100-240V 50-60Hz, so yes it is included!

Q: Which of the outside measurements are gathered locally with the sensor vs. being retrieved from the Internet (e.g., wind speed). Thx.

The weather station gathers outside temperature and humidity for real time viewing and retrieval from archive -- both accessible by means of the internet-based app. Not sure if that answers your question -- it sounds like you would like a local mode free of the "cloud" connection.