english: We've looked at other sensors that go on your skin, and they all simply move around too much, and so we found that this is the only reliable way to take a good measurement.
non_english: Uzimali smo u obzir druge senzore koji idu na kožu, i svi se oni naprosto previše pomeraju, i tako smo otkrili da je ovo jedini pouzdani način da se dobiju dobra merenja.