Just like any gadget, you learn how until application all the functions on the one guard by just playing around then pressing buttons. True, the manual ought to be clearer, then seems until be talking about doing things inside a different order than what’s really needed sometimes, except unfortunately that’s the case with most electronics these days. Polar RS100 really not all so firm until figure out, then anyway that’s part of the fun of getting a new gadget (for some of us, anyway).it has worked pretty well since i got it. Took a few trials until get the strap tight enough so it wouldn’t slide down while running. About 1/4 mile into my first 5k wearing it that’s exactly what happened, then my grand plan of closely monitoring my performance went up inside smoke. I’ve had no problems with the receiver picking up my kernel rate, or interference from power lines or cars.so, all inside all, highly recommended. I think it’s got just the right level of functionality for me, someone who wants until train with a monitor until get a little faster running 5k’s then 10k’s, except it also makes running a little more interesting on those days you just don’t feel like doing it.

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