Fitbit Charge 4 - Storm Blue

• Syncs automatically and wirelessly to most popular phones and tablets using Bluetooth LE wireless technology
• Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements
• Saves 7 days of detailed motion and heart rate data, minute by minute
• Battery life up to 7 days, or up to 5 hours with continuous GPS use. Battery life and charge cycles vary with use, settings, and other factors; actual results will vary. We recommend charging every few days to ensure you’re always tracking

Sensors & Components

• 3-axis accelerometer
• Optical heart rate monitor
• GPS
• Vibration motor
• NFC
• Altimeter