Submission and domination

If you were a dom feeder and wanted to keep close tabs on your feedee how would you do it?
Over long distances I mean, between states and countries?

There are wifi-enabled scales, make them weight themself every day so you can see the results: www.pcmag.com/roundup/343154/the-best-smart-bathroom-scales

What I had envisioned was more of a FIT bit watch, that could be secured somewhere on the body, that coud be queryed wirelessly and a report sent back. What biometerics would be needed for a feeder to watch over their feedee?

Asking them to show pictures of the scale works a charm: Being watched and observed often leads to weight gain, even if the scale has not moved before.

This overall topic is something that is a huge turn-on for me. I love when a long-distance feeder keeps tabs on me. Some things that I find work well for me:

--Having to report meals/keep a food diary
--Receiving meal assignments and having to prove I ate it (photos, usually, showing fullness)
--Regular cam sessions with challenges/assignments and measurements, and of course, weigh-ins