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Fitbit Sense – Advanced Health Smartwatch – Silver with Sage Grey Band – FB512SRSG

Sale price
$89.99
Regular price
$249.99
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64%
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Condition: Excellent

Fitbit Sense – Advanced Health Smartwatch – Silver with Sage Grey Band – FB512SRSG

Condition
Price
Excellent
$89.99
$249.99
Good
$79.99
$249.99
Eco-Save
$69.99
$249.99
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12 Month Warranty

on most devices

30-Day Money Back Guarantee

on every device

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most orders ship same day

Description

The Fitbit Sense is a stainless steel smartwatch featuring a Sage Grey Infinity band and a high-resolution AMOLED touchscreen. Designed for everyday wear, it includes built-in GPS, app-based sensor tracking, smart notifications, and voice assistant compatibility. It is water resistant up to 50 meters and supports multi-day battery life on a single charge.

Key Features:

  • EDA Sensor – Collects skin response data available through the Fitbit app (not intended for medical use).

  • ECG App – Enables on-demand rhythm recording; data viewable in app (availability varies by region).

  • Skin Temperature Sensor – Provides overnight variation estimates via app sync.

  • Heart Rate & SpO₂ Sensors – Tracks heart rate trends and oxygen saturation estimates (informational only).

  • Built-in GPS – Logs outdoor distance and pace without requiring a phone.

  • Battery Life – Up to 6+ days; fast charging provides approximately 1 day of use in 12 minutes.

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

  • Smartphone Notifications – View calls, texts, calendar, and app alerts when paired via Bluetooth.

  • Water Resistance – Rated 5 ATM (up to 50 meters); suitable for swim activities.

  • Device Compatibility – Works with iOS and Android smartphones using the Fitbit app.

Product Specifications:

  • Model Number: FB512SRSG

  • Case Material: Stainless Steel (Silver)

  • Band: Sage Grey Silicone Infinity Band (Small & Large included)

Display:

  • AMOLED color touchscreen

  • Always-On Display Mode

  • Corning Gorilla Glass 3

Sensors & Components:

  • ECG (via app)

  • EDA (Electrodermal Activity)

  • Skin temperature sensor

  • Optical heart rate monitor

  • Red/infrared SpO₂ sensors

  • Built-in GPS + GLONASS

  • Gyroscope

  • Altimeter

  • Ambient light sensor

Connectivity:

  • Bluetooth 5.0

  • Wi-Fi (802.11 b/g/n)

  • NFC (Fitbit Pay supported)

Battery:

  • Life: Up to 6+ days

  • Fast charge: ~12 minutes for 1 day of use

Water Resistance:

  • WR50 (up to 50 meters)

Compatibility:

  • iOS 13.3+

  • Android 8.0+

Dimensions: 40.48 × 40.48 × 12.35 mm
Weight: 45.9 g (1.62 oz)

What’s in the Box:

  • Fitbit Sense Smartwatch – Silver (FB512SRSG)

  • Sage Grey Infinity Band – Small & Large Sizes

  • Charging Cable

See Specifications
Brand R3NEW
Title Fitbit Sense – Advanced Health Smartwatch – Silver with Sage Grey Band – FB512SRSG
Model Fitbit Sense
Screen Size 40mm
Color Silver Case / Sage Grey Band

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.