Here a quote:
"The TomTom Runner Cardio measures your heart rate differently to the way a chest strap sensor does. Instead employing a type of electrocardiography to measure your heart physically beating, the Runner Cardio uses an optical sensor that’s mounted in the rear of the watch.
Accompanying that sensor are two very bright LEDs, which shine through the surface of the skin. The sensor then measures any changes in skin colour, since skin tone changes ever so slightly when your blood pumps through it. By tracking those changes in skin tone, the Runner Cardio can calculate your heart rate."
From EXPERT REVIEWS - go to the page to read more.
I am still using my GARMIN watch but a strapless solution seems to be quite convenient - the question is only how good it really works ...
There are so many products on the market including various apps that it is worth to read a little bit before you decide to buy one.
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