• Fitbit Charge 4
• Classic wristbands (both small & large)
• Charging cable

• Fitbit Charge 4
• Woven reflective band (both small & large)
• Classic wristband (both small & large)
• Charging cable

• 3-axis accelerometer
• Optical heart rate monitor
• GPS + GLONASS
• Red and infrared sensors for oxygen saturation (SpO2) monitoring
• Device temperature sensor (skin temperature variation available in the Fitbit app)
• Vibration motor
• NFC
• Altimeter

Battery life up to 7 days, or up to 5 hours with continuous GPS use. 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.

•  Type: Lithium-polymer
• Charge time (0-100%): Two hours
• Radio transceiver: Bluetooth

• Saves 7 days of detailed motion and heart rate data, minute by minute

Water-resistant to 50 metres.

This tracker includes a plastic resin case and the band includes a stainless steel buckle. The classic band is made of a flexible, durable material similar to that used in many sports watches. The woven band is made from a comfortable polyester.

Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.

• Operating temperature: -20° to 60° C
• Maximum operating altitude: 8,535 m

Syncs automatically and wirelessly to most popular phones using Bluetooth LE wireless technology.

• Syncing range: Up to 9 metres
• Certain features like smartphone notifications may require Android 7.0+. Check your device compatibility.
• Syncing to mobile devices requires Bluetooth LE and internet connection.
• Music control via Bluetooth LE on Android and iOS devices.

Print this guide to find the right size for you.

Small

• Fits wrist 140 mm – 180 mm in circumference

• Fits wrist 180 mm – 220 mm in circumference

• 35.8mm l x 22.7mm w x 12.5mm h