Temperature, water, power monitor during winter months away from home

I want to leave for a Month this winter and looking for something to monitor my furnace that can call out if something happens.

I found this, but can’t find any reviews.

Seems like a simple and inexpensive unit.

Need some ideas other than the bulb in the window. :slight_smile:

Is this it?

Thanks Marc, never thought to look in Amazon, but the price is double on Amazon for the same unit.
Wonder what gives with that?