The Cheapest Way to Signal What You Work On
You want the thing on your bag to say something about what you do, and you do not want to spend money on it.

Where the time actually goes
There is no efficiency argument for a charm and we are not going to manufacture one.
How the Pixel Charm changes it
Two moulded charms on braided paracord with black triangular carabiners — real gates, not split rings, so they go on and off without a fingernail.
Where it sits in a real workflow
It hangs on a bag. That is the workflow. What it does do, better than most things at this price, is act as a giveaway: it is small, it does not break, it costs almost nothing, and people keep it.
Doing the arithmetic yourself
None. See above.
Who gains most from the Pixel Charm?
Impulse buyers, gift-givers, and anyone assembling a conference handout. If you want something that actually does something, the Keycap Fidget has working switches for four dollars more.
The first twenty minutes
Clip it on.
Related
Pixel Charm, $15 — full specification, frequently asked questions and what to know before buying. Or look at the Keycap Fidget, which solves a neighbouring problem.
futuredevice sells AI hardware for everyday life. Type less. Ship more.