A:AnswerIt can roughly monitor your heart rate based on reflections of light into your skin. I do not believe it's software is sophisticated enough to detect ventricular fibrillation (afib). Certainly the current design has no way to indicate that detection.
A:AnswerWhat would be the real purpose? I have a 7 yr old great granddaughter who will be 8 soon and I would not buy this fitbit for her. I would look for something more suitable for a child rather than an adult. Hope this helps.
A:AnswerContact Fitbit. I had a different fitbit and they sent me a new battery. They even sent me a new charger. They want you happy. They stand behind their product.