Meet Fitbit\'s most advanced fitness & health tracker The Fitbit Charge 5 smartwatch, with smart functions to help you take charge of your routines and start your journey to an active and healthy lifestyle. What\'s in the box Fitbit Charge 5Infinity band (small & large)Charging cable Sensors & Components Optical heart rate monitor3-axis accelerometerBuilt-in GPS + GLONASSRed and infrared sensors for oxygen saturation (SpO2) monitoringDevice temperature sensor (skin temperature variation available in the Fitbit app)Vibration motorAmbient light sensorRadio transceiver: BluetoothNFCMultipurpose electrical sensors compatible with ECG app & EDA Scan app (App not available in all countries) Battery & Power Battery life of up to 7 days. The use of the always-on display and SpO2 features will require more frequent charging. Fitbit recommends charging your tracker every few days to ensure you are always tracking.Battery type: Lithium-polymerCharge time (0-100%): Two hours Memory Saves 7 days of detailed motion data, minute by minuteSaves daily totals for the last 30 daysStores heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times Water Resistance Water-resistant to 50 meters. After getting the band wet, Fitbit recommends drying the band because, as with any wearable device, it\'s best for your skin if the band is clean and dry, CareGive your wrist a rest by taking the band off every now and then. If the band gets wet or you sweat in it, remove and completely dry the band before putting it back on. Learn more. MaterialsThe Charge 5 housing is made of aluminium, glass and resin. The band is made of silicone and has an aluminium buckle. Heart RateLike all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements. Environmental Requirements Operating temperature: -10° to 45°CMaximum operating altitude: 8.500m Syncing The Fitbit app is compatible with most popular phones. To set up and use your Fitbit products and services, you must install the Fitbit app on a compatible device running one of the following operating systems: Apple iOS 12.2 or higher.Android OS 8.0 or higher. Syncing range: Up to 9m Certain features like smartphone notifications may require Android 8.0+.Syncing requires Bluetooth® LE and an internet connection.Syncs with Mac OS X 12.2 and up, iPhone 5S and later, Android 8.0 and later. Band Size Small: Fits wrist 5.1\" - 6.7\" in circumferenceLarge: Fits wrist 6.7\" - 8.3\" in circumference