At least 1 is a GSC-10. They're both very similar. And... They don't work with the latest generation of Garmin watch. But they do work with most Garmin devices up through a while ago.
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I have one spoke magnet and one crank magnet. Each of these requires one of each so you're down 2 magnets.
The batteries appear to work (when I push reset the lights blink different colors).