My understanding is that it's an open ecosystem thing, I'd check but I only have a Tickr, which wouldn't prove anything.
Googling makes me think you're right, but it's not made super obvious.
Annoying because I would buy a tickr if they were available.
I have a cheap HRM somewhere in a box. If I can find it you are welcome to borrow it and test things.
@ started
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My understanding is that it's an open ecosystem thing, I'd check but I only have a Tickr, which wouldn't prove anything.