Fitbit – Sense 2 Advanced Health Smartwatch – Graphite – FB521BKGB-US

$89.99

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Estimated delivery dates: Dec 19, 2025 - Dec 20, 2025
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Description

The Fitbit Sense 2 is a multifunction smartwatch designed with a graphite finish and built-in sensors for motion, temperature, and heart rate trend tracking. With a bright AMOLED touchscreen, built-in GPS, and support for smartphone notifications and voice assistants, it offers a feature-rich experience in a compact, water-resistant design.


Key Features:

  • EDA Sensor – Collects electrodermal activity data for surface-level skin response tracking (app access required).

  • Built-In GPS – Records pace and distance for outdoor activities without requiring a smartphone connection.

  • Heart Rate Sensor – Tracks heart rate trends continuously and provides high/low notifications (not intended for medical use).

  • ECG App – Records on-wrist heart rhythm data via app (availability varies by region; not for diagnostic purposes).

  • SpO₂ & Skin Temperature – Estimates overnight blood oxygen levels and skin temperature variations (data available in Fitbit app only).

  • Sleep Tracking – Estimates time spent in various sleep stages and provides a daily sleep summary (viewable in the app).

  • Smart Notifications – Displays call, text, and app alerts when paired with a compatible phone.

  • Voice Assistant Support – Compatible with Amazon Alexa and Google Assistant (account setup required).

  • Fitness Tracking – Tracks step count, motion intensity, and includes multiple exercise modes.

  • Battery Life – Lasts up to 6+ days per charge; fast charging provides one day of use in about 12 minutes.

  • Water Resistance – Rated up to 50 meters; suitable for swim activities.


Specifications:

  • Model Number: FB521BKGB-US

  • Color: Graphite

  • Display: AMOLED touchscreen

  • Battery Life: Up to 6+ days (varies by usage)

  • Compatibility: iOS 13+ and Android 9.0+

  • Water Resistance: 5 ATM (up to 50 meters)

Sensors:

  • ECG (via app)

  • EDA (Electrodermal Activity)

  • Optical heart rate sensor

  • SpO₂ sensor (data available in app only)

  • Skin temperature sensor (variation only)

  • Accelerometer

  • Altimeter

  • Gyroscope

  • Ambient light sensor

Connectivity:

  • Bluetooth

  • Wi-Fi

  • NFC (Fitbit Pay supported)

Dimensions: 1.58 x 1.58 x 0.45 inches
Weight: Approx. 1.3 oz


What’s in the Box:

  • Fitbit Sense 2 Smartwatch – Graphite (FB521BKGB-US)

  • Small and Large Bands

  • Charging Cable

Additional information
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