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I think it's a standard BLE/ANT+ training sensor, any existing training program should be able to read it out of the box. Still a fun project, though.

But I agree it's an odd device. If one wants more precision than the optical sensors found in smart watches, using a HR belt would be the logical choice?

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I've tried chest straps once or twice and found them pretty uncomfortable, though its possible I would get used to it.

The advantage of these standalone optical sensors is that because they are smaller & lighter, and sit on the fleshier upper arm, they are much more accurate than sensors on a watch, despite being the same tech.

Edit: DC Rainmaker's analysis shows that these are more or less as good as a chest strap (https://www.dcrainmaker.com/2019/03/polar-oh1-plus-optical-h...)

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