Hot Coffee

I have the bad habit of preparing a cup of coffee, then walking away from it to do something else. When I return to it, it's lukewarm or cold...

My son introduced me to a cup that solves the problem...

Linked to an app on his phone, this cup somehow warms the coffee to a designated temperature and keeps it warm.

I'm not sure how it works. I see no electric connections, though it sits on a special (recharging?) saucer when not in use. 

But it was nice to drink coffee that got warmer instead of cooler...

I'm not sure how that happened. My son was in control of the app.