![]() ![]() ![]() Large: Fits wrist 6.7" - 8.3" in circumference.Small: Fits wrist 5.1" - 6.7" in circumference.Syncs with Mac OS X 12.2 and up, iPhone 5S and later, Android 8.0 and later. ![]() Syncing requires Bluetooth LE and internet connection.Certain features like smartphone notifications may require Android 8.0+.FitBit App on compatible devices with following operating systems: Apple iOS 12.2 or higher.,Android OS 8.0 or higher.Operating temperature: 14 degrees to 113 degrees F.Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.The band is made of silicone and has an aluminum buckle. The Charge 5 housing is made of aluminum, glass and resin.Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times.Saves daily totals for the last 30 days.Saves 7 days of detailed motion data, minute by minute.Device temperature sensor (skin temperature variation available in the Fitbit app).Red and infrared sensors for oxygen saturation (SpO2) monitoring. ![]()
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