Looks nice and I’d like it even more, had it an USB-C port with display output.
But even in the current configuration it’s a nice gadget at a reasonable price point.
4 GB RAM is not exactly great for a kind of desktop computer (even with Linux), but using this thing as a server with a built-in keyboard and display would have saved me some trouble I faced with unresponsive RaspberryPis.

So, how do you know?

You’re adding to the confusion.
kWh (as in kW*h) and not kW/h is for measurement of energy.
Watt is for measurement of power.