Fitbit Charge 4 Advanced Health & Fitness Tracker Smartwatch with Built-in GPS 24/7 Heart Rate Tracking

Battery & Power

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.

Battery type: Lithium-polymer

Charge time (0-100%): Two hours

Radio transceiver: Bluetooth 4.0

Memory

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

Saves daily totals for past 30 days

Measures 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 swimming or getting the band wet, we recommend drying the band because, as with any wearable device, it's best for your skin if the band is clean and dry. We do not recommend wearing Fitbit Charge 4â„¢ in a hot tub or sauna. Learn more. Care Give 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.

Materials

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.

Heart Rate

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

Environmental Requirements

Operating temperature: -4° to 140° F

Operating temperature: -20° to 60° C

Maximum operating altitude: 28,000 feet

Maximum operating altitude: 8,535 m

Syncing

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

Syncing range: Up to 30 feet

Certain features like smartphone notifications may require Android 7.0+. Check your device compatibility.

Syncing to mobile devices requires Bluetooth LE and internet connection.

Syncs with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later. Music control via Bluetooth LE on Android and iOS devices.

Band Size

Print this guide to find the right size for you. Both small and large sizes included in box.

Small

Fits wrist 5.5" - 7.1" in circumference

Fits wrist 140 mm - 180 mm in circumference Large

Fits wrist 7.1" - 8.7" in circumference

Fits wrist 180 mm - 220 mm in circumference

Sensors & Components

3-axis accelerometer

Optical heart rate monitor

GPS

Vibration motor

NFC

Altimeter