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Shop the Fitbit Collection

	Add to Cart	Add to Cart	Add to Cart		Add to Cart
Customer Reviews	4.2 out of 5 stars 3,871	4.3 out of 5 stars 10,795	4.0 out of 5 stars 30,985	4.3 out of 5 stars 9,765	4.4 out of 5 stars 12,576
Battery life (in days)	6	6	7	5	10
Steps, distance & calories	✔	✔	✔	✔	✔
24/7 heart rate & AZM	✔	✔	✔	✔	✔
Built-in GPS	Yes	Yes	Yes	Connected GPS	Connected GPS
Sleep tracking & sleep stages	✔	✔	✔	✔	✔
Sleep Profile & Sleep Score	✔	✔	✔	✔	✔
Blood Oxygen (SpO2)	✔	✔	✔	✔	✔
Stress Management Score	✔	✔	✔	✔	✔
All-day body response tracking	✔	✘	✘	✘	✘
ECG app for Afib detection	✔	✘	✔	✘	✘
Call, text & app notifications	✔	✔	✔	✔	✔
Alexa built-in	✔	✔	✘	✘	✘

Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Fitbit is part of the Google family. 1) The Fitbit ECG app is only available in select countries and with select devices. Not intended for use by people under 22 years old. See fitbit.com/ecg for additional details. 2) Irregular rhythm notifications are only available in select countries and with select Fitbit products; not intended for use by people under 22 years old or with other known arrhythmias. See fitbit.com/irregularrhythm for additional details. 3) Not available in all markets. The SpO2 feature is not intended to diagnose or treat any medical condition or for any other medical purpose. It is intended to help you manage your well-being and keep track of your information. 4) The Health Metrics dashboard and the metrics displayed in the dashboard are not available in all countries. This feature should not be relied on for any medical purposes. It is intended to provide information that can help you manage your well-being. The SpO2 feature requires more frequent charging. 5) Requires a Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only. 6) When phone is nearby. 7) See bank and transit availability at fitbit.com/fitbit-pay/banks 8) Amazon, Alexa and all related marks are trademarks of Amazon.com, Inc. or its affiliates. Alexa is not available in all languages and countries. Alexa features and functionality may vary by location. 9) Varies with use and other factors. Up to 12 hours with continuous GPS. Get 24 hours of charge with 12 minutes of charging. 10) 6 months of Premium for New Premium users only. Must activate with device. Valid payment method required. Free trial must be activated within 60 days of device activation. Cancel before free trial ends to avoid subscription fees. Requires use of Fitbit app with compatible iPhone or Android devices. A Google account will be required.

• Product Dimensions ‏ : ‎ 1.57 x 0.47 x 1.57 inches; 7.04 ounces
• Item model number ‏ : ‎ FB521GLBM-US
• Batteries ‏ : ‎ 1 Lithium Ion batteries required. (included)
• Date First Available ‏ : ‎ September 23, 2022
• Manufacturer ‏ : ‎ Fitbit Inc
• ASIN ‏ : ‎ B0B4MV1TGL