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

Sale price
$69.99
Regular price
$249.99
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72%
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Condition: Eco-Save

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

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

on most devices

30-Day Money Back Guarantee

on every device

Fast Shipping

most orders ship same day

Description

The Fitbit Sense offers powerful health and wellness insights in a sleek, premium stainless steel design. With a high-resolution AMOLED touchscreen, built-in EDA and ECG sensors, and SpO₂ and GPS tracking, it’s built to help you stay in tune with your body. Paired with a soft Sage Grey Infinity Band (small and large sizes included), the Sense is designed for both comfort and performance—delivering personalized data and up to 6+ days of battery life.

Key Features

  • EDA Sensor
    Tracks electrodermal activity to help assess your body's stress response (viewable in the Fitbit app).

  • ECG App
    On-demand rhythm assessments offer insights into heart health (availability may vary by region).

  • Skin Temperature Sensor
    Detects overnight variation in skin temperature to help identify changes in wellness.

  • Heart Rate & SpO₂ Monitoring
    Continuous heart rate tracking and estimated blood oxygen saturation during sleep (not intended for medical use).

  • Built-in GPS + GLONASS
    Record outdoor routes, pace, and distance without needing your phone.

  • Smart Notifications
    Get call, text, app, and calendar alerts directly on your wrist when connected via Bluetooth.

  • Voice Assistant Support
    Use Amazon Alexa or Google Assistant to check the weather, set reminders, and more (requires account setup).

  • Fast Charging + Long Battery Life
    Up to 6+ days on a full charge; get 1 full day of use in ~12 minutes with fast charging.

  • Water Resistance
    Rated 5 ATM (up to 50 meters); safe for swimming and showering.

Product Specifications

  • Model Number: FB512SRSG

  • Color: Silver Stainless Steel Case with Sage Grey Infinity Band

  • Band Sizes Included: Small & Large (interchangeable)

Display

  • Type: AMOLED Color Touchscreen

  • Always-On Display Mode

  • Protection: Corning® Gorilla® Glass 3

  • Dimensions: 40.48 × 40.48 × 12.35 mm

  • Weight: 45.9 g (1.62 oz)

Sensors & Components

  • ECG App

  • EDA Sensor

  • Skin Temperature Sensor

  • Optical Heart Rate Monitor

  • Red/Infrared SpO₂ Sensor

  • Built-in GPS + GLONASS

  • Gyroscope, Altimeter

  • Ambient Light Sensor

  • Vibration Motor

Connectivity

  • Bluetooth 5.0

  • Wi-Fi (802.11 b/g/n)

  • NFC (Supports Fitbit Pay)

Battery

  • Type: Lithium-polymer

  • Battery Life: Up to 6+ days

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

  • Charging Method: Magnetic USB cable (included)

Compatibility

  • iOS 13.3+

  • Android 8.0+

What’s in the Box

  • Fitbit Sense Smartwatch – Silver Stainless Steel (FB512SRSG)

  • Sage Grey Infinity Band – Small & Large Sizes

  • Magnetic USB 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.