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

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$99.99
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$249.99
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Condition: Excellent

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

Condition
Price
Excellent
$99.99
$249.99
Sold out
Good
$89.99
$249.99
Sold out
Eco-Save
$79.99
$249.99
Sold out
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Fitbit - Sense 2 Advanced Health Smartwatch - Graphite - FB521BKGB-US
Condition: Excellent

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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

See Specifications
Brand R3NEW
Title Fitbit - Sense 2 Advanced Health Smartwatch - Graphite - FB521BKGB-US
Model Fitbit Sense 2
Screen Size 40.5
Color Graphite

FAQ

What kind of warranty/guarantee do you offer?

At R3NEW, most transactions are backed by a 1-year warranty, covering technical defects and malfunctions, while every purchase includes a 30-day guarantee. Our warranty is designed to give you peace of mind, ensuring the reliability and longevity of your device.

What's the difference between the conditions? (Excellent, Good, EcoSave)

Great question! Let us break down the difference.

Excellent: Our Excellent condition devices offer a pristine user experience that rivals new units, boasting a flawless appearance with no visible scratches on the display or body. Each device undergoes rigorous testing to ensure it operates like new, giving you peace of mind with a full year of warranty coverage. It’s an ideal choice for those seeking near-new quality without the brand-new price tag

Good: Devices in Good condition are a great compromise between cost and quality. You might find a few minor scratches or slight nicks on the body or display, but these are purely cosmetic and don’t affect the device’s operation. We suggest using a case to bring its external appearance closer to 'like new.' Rest assured, every device meets our strict functional standards and comes with a one-year warranty for functionality

EcoSave: Opt for our EcoSave condition if you want to maximize value while minimizing environmental impact. These devices show visible signs of use, such as scratches or dents, which are purely cosmetic and can often be concealed with a case. Each device has passed our comprehensive functional tests and is backed by a one-year warranty, ensuring it works perfectly for you while also being kind to the planet.

Can I trust R3NEW?

We've sold electronics for over 15 years and are one of top trusted sources of certified refurbished electronics. Plus, with a 30-day guarantee and 12 month warranty, you can shop with peace of mind. If you have any issues at all, just email our support team and we'll help you out.