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

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