Very inaccurate. I regularly check my pulse after cardio. My Fitbit shows me a speed of 122 bpm and this clock is 54 bpm. Have your blood pressure tested and get 120/80, then immediately check again and get 104/62. I also usually have to charge it twice a day to keep it going. The app doesn't connect to Google Fit, which is disappointing because that's what I got this thing for.
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