I have been using polar optics for many years. This is an updated version or the latest version. Firstly, it is much more convenient as the strap is easily adjustable and the optics head is inserted into a curved mount. in holder. Those are all good things. My only issue is that here, as with previous iterations, the optical reader loses the ability to send a signal from time to time. I've been training for a long time and after 1/2 hour of training my heart rate starts to drop due to signal issues. If I reset the strap to a different range, the speed may come back. However, some adjustments may be required that disrupt training. I've tried tightening the band and changing the contact areas when I start exercising. It doesn't seem to help. And this is done with various readers and heart rate apps. This device is convenient and accurate. He agrees with other HR readers. However, the occasional transmission loss issues are annoying.
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