Was prepared for some disappointment with cheap Chinese junk as it costs significantly less than various other alternatives. I've bought several of these over the years and have usually suffered from poor interfaces or various other incompatibilities. This time NO. Worked perfectly. A small light will flash to confirm it is "doing something". The strap is comfortable but the connection of the strap is a bit small/weak so this may or may not be a potential issue (in the future) - but for now it's good. Works with both my watch and my android phone with bluetooth. Excellent work! I will buy again.
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