Heart Rate : Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.-We do not recommend wearing Fitbit Charge 4 in a hot tub or sauna.-After swimming or getting the band wet, we recommend drying the band, as with any wearable device, it's best for your skin if the band is clean.Water Resistance :Water resistant to 50 meters.Sensors and Components- 3-axis accelerometer, Optical heart rate monitor, GPS, Vibration motor,NFC and Altimeter.-Measures heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times.Memory:Saves 7 days of detailed motion and heart rate data, minute by minute.Saves daily totals for past 30 days.Battery : Battery life up to 7 days, or up to 5 hours with continuous GPS use.Charge time (0-100%): Two hours.Accessories : Switch up your look with accessories that let you wear your tracker or smartwatch your way.Personalized Reminders :Stay on track toward your goals with personalized reminders that remind you to stay active,hydrated, stick to a sleep schedule.
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