The best thing for the money, I'm glad I chose this option.
This strap still has a plus: it is perforated and breathes well. On this, perhaps everything. A piece of garbage, not a strap. Be prepared to buy a normal strap for them, except for it everything is super.
Pros
Comfortable, everything is perfectly visible even in the bright sun, it is very convenient that it tells the heart rate zone by vibration.
Cons
The strap is just disgusting. The iron tongue clings to everything it can: towels, clothes, bed linen. After a month of use, the tail of the strap began to peel off, because it also constantly rubs against something. What is unfortunate is that the polar has normal straps with an adequate tail of the clasp and a recess for it, but it is sold separately for 30 euros. This, of course, is disgusting, to make a deliberately bad strap and immediately offer to pay extra for the same silicone, not made of leather or metal, just silicone with a normal clasp. 30 euros. I blame.
I was a little saddened by the functionality of setting up information on the screen. Firstly, you cannot set up your custom screen for everyday display, only for sports profiles. As a result, I walk either with heart rate or with activity. In the sports profiles themselves, the standard running screen is almost perfect, I would like to tweak it a bit to fit my needs, but there is no such possibility, you can only assemble a new, much less informative screen from the elements. I would prefer that the default template has the ability to replace elements or have access to the layout of the screen.