After about 3 months of operation, the strap "smelled". Some kind of plastic smell. I wash the strap after each workout, this is doubly unpleasant for the fact that some shortcomings climbed so early. The strap bends a little with a groove, this is not critical, but still for this price I would like the absence of such problems. All other shortcomings are more related to the Polar Beat application and it is inappropriate to mention them here. In general, the device is not bad. There are no particular problems with the survivability of the battery - I have been using it for less than six months, but the battery is elementary to change. I did not notice any problems with pairing with devices either. It is also possible to use two programs at once on one device to control the pulse, maybe more is possible, but I haven’t tried it and don’t see the point, even 2 applications are more for comparison than out of objective necessity. Well, the accuracy of the level of the chest heart rate sensor under load cannot be replaced by any other device (except for similar ones, of course)
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