E600, E500, E400 Cheap ECG smartwatches w. breast strap

I bought this cheap E600 smart watch out of curiosity of what a breast strap mount can do.

And it is certainly better than I expected for the price, though not without its flaws!

UPDATE: The first unit is broken after just six weeks, refusing to charge!!
UPDATE II The E400 is broken with same failure, bought a E420, and adjusted a bit on that.

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