- TrueGrade tested — passes our 25-point inspection
- Fast, tracked shipping
- 90-day returns
- Up to 70% cheaper than new
Fitbit Sense 40mm – Graphite Aluminum/Black Sport Band
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Buy a certified refurbished Fitbit Sense 40mm in Graphite Aluminum/Black Sport Band from $31 at Device Giant — every Sense 40mm is fully tested under our 25-point TrueGrade inspection, ships unlocked-ready, and is backed by our 90-day warranty and free US shipping. The Fitbit Sense 40mm, released in 2020, is Fitbit's advanced health smartwatch, designed for comprehensive well-being tracking. It stands out with its innovative health sensors, including an EDA (electrodermal activity) sensor for stress management, an ECG app for heart health assessments, and an on-wrist skin temperature sensor. Beyond its health capabilities, the Sense offers built-in GPS for tracking outdoor activities without a phone, Fitbit Pay for contactless payments, and a vibrant AMOLED display with an always-on option. Its sleek design and comfortable sport band make it suitable for all-day wear. Compare grades, storage and carrier options below and save versus buying new.
Sense 40mm key features
- EDA Sensor for stress management
- ECG App for heart health
- On-wrist skin temperature sensor
- Built-in GPS
- Fitbit Pay
- Always-on AMOLED display
- Up to 6+ days battery life
- Voice Assistant (Alexa/Google Assistant)
Sense 40mm full specifications
| Display | 1.58 inches AMOLED, 336 x 336 |
|---|---|
| Storage | 4GB |
| Battery | 159 mAh, Proprietary magnetic charging (approx. 12W) |
| Build | Aluminum case, stainless steel sensor ring, silicone band, Water resistant up t |
| Operating system | Fitbit OS |
| Biometrics | Health biometrics: Optical heart rate, Electrodermal Activity (EDA), Skin temperature |
| Dimensions | 40.4 x 40.4 x 12.4 mm |
| Weight | 30 g |
Why buy a refurbished Sense 40mm?
- Save big — a used Sense 40mm starts at just $31, well below retail.
- 25-point TrueGrade tested — battery, screen, cameras, buttons and network all verified.
- 90-day warranty & free shipping on every Sense 40mm.
- Better for the planet — buying refurbished keeps e-waste out of landfills.
- Advanced health tracking capabilities
- Integrated GPS for phone-free workouts
- Contactless payments with Fitbit Pay
Sense 40mm pros and cons
Pros
- Comprehensive health and fitness tracking
- Excellent battery life for a smartwatch
- Accurate GPS tracking
- Useful stress management tools
- Sleek and comfortable design
Things to know
- Proprietary Fitbit OS limits third-party apps
- No cellular connectivity option
- Charging is proprietary
- Health features require Fitbit Premium for deeper insights
Carrier compatibility
This refurbished Sense 40mm is available unlocked and compatible with GPS. Check the carrier selector above — we only show options we have in stock so you can buy the exact Sense 40mm that works on your network.
Storage options
Choose the Sense 40mm in 4GB. Pick more storage for photos, apps and offline media.
TrueGrade condition guide
- Grade A — Excellent: like-new, minimal to no visible wear.
- Grade B — Great: light signs of use, fully functional.
- Grade C — Fair: visible wear at the best price.
- As-is / damaged: clearly described cosmetic or functional notes, priced accordingly.
Sense 40mm — frequently asked questions
Is the Fitbit Sense 40mm still worth buying in 2026?
Yes — with EDA Sensor for stress management and a proven design, the Sense 40mm remains a great-value refurbished phone, especially at $31 with a 90-day warranty.
Does the refurbished Sense 40mm come unlocked?
Most Sense 40mm units are sold unlocked and ready for GPS. Carrier-specific versions are clearly labeled in the carrier selector.
How much does a used Sense 40mm cost?
At Device Giant a refurbished Sense 40mm starts from $31, with the exact price depending on storage, carrier and TrueGrade condition.
What's included with a refurbished Sense 40mm?
Your Sense 40mm ships fully reset and tested with a compatible charging cable, a 90-day warranty and free shipping. Accessories vary by condition.
What do the condition grades mean?
See the TrueGrade guide above — A (excellent), B (great), C (fair) and clearly-described as-is options, so you can pick the right balance of price and cosmetics for your Sense 40mm.
Every device is graded for cosmetic condition and tested for full function against our TrueGrade 25-point inspection. Buying refurbished keeps a working phone out of landfill — better for your wallet and the planet.
Better for your wallet & the planet
Every refurbished phone is a win for the planet
Choosing refurbished over new keeps a working device out of landfill — and skips the carbon, water and raw materials it takes to build a brand-new one. A small choice with real impact.
Less carbon
Most of a phone's lifetime emissions come from manufacturing. Reuse skips nearly all of it.
Less e-waste
Millions of devices are trashed every year. Every reused phone is one less in a landfill.
Fewer raw materials
No new mining of rare metals, no manufacturing water use — the device already exists.
Circular by design
When a device truly can't be saved, we harvest its working parts and recycle the rest responsibly.
Refurbished is not a compromise. It is the smarter, greener way to buy tech, and every TrueGrade device ships tested, graded and ready for its second life. See how we do it →
