Fitbit Versa 4 Fitness Smartwatch
- 1.58 inch AMOLED touchscreen, 348 x 442
- Built-in GPS, SpO2 and heart rate sensors
- 6 day battery, 12 minute top-up listed
- 50 meter water resistance
- 40+ exercise modes, 4 GB storage
- iOS 16.4+ or Android 11+ phones
- 1 year warranty, 3-month Premium trial
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A full-featured fitness watch with built-in GPS, many exercise modes and a color AMOLED screen. Some features depend on a paid membership after the included trial.
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ASIN: B0B4MWCFV4Model: FB523BKBK-USCategory: Smartwatches
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Overview
Fitbit builds this Versa model around a square AMOLED touchscreen and a silicone Classic band. Heart rate, blood oxygen and temperature sensors feed fitness and sleep tracking, and calls, texts and notifications arrive from a nearby phone.
Built-in GPS lets runs be tracked without carrying the phone, and the daily readiness score guides training. That score and some content require a paid Fitbit membership, which is included only for a trial period.
Who it's for
A fitness-minded person with a recent iPhone or Android who wants workout tracking, notifications and a fast charge. Someone who wants every metric without any membership should check what the free tier offers first.
Pros and cons
- Built-in GPS for phone-free runs
- Bright AMOLED touchscreen
- Quick top-up charging
- Water resistance for swimming
- Readiness score needs a membership
- Oxygen tracking drains the battery faster
- Some features vary by country
- Storage use for music not detailed
Performance notes
Battery life varies with use, and continuous GPS drains it far faster than everyday wear. The listing states that blood oxygen tracking calls for more frequent charging. A quick top-up gives a day of charge, so a short charge during a shower covers most gaps.
Specifications
| Brand | Fitbit |
|---|---|
| Model | FB523BKBK-US |
| Dimensions & fit | |
| Screen size | 1.58 inches |
| Water resistance depth | 50 meters |
| Band length | 40.5 millimeters |
| Item weight | 6.3 ounces |
| Item Dimensions | 1.57 x 0.43 x 1.57 inches |
| Capacity & performance | |
| Memory storage capacity | 4 GB |
| Battery Capacity | 350 milliamp_hours |
| Power & efficiency | |
| Battery average life | 6 days |
| Battery charge time | 12 minutes for a day of use |
| Battery Cell Type | Lithium Ion |
| Construction & materials | |
| Band material type | Silicone |
| Case material type | Plastic, resin or nylon |
| Color | Black/Graphite |
| Compatibility & installation | |
| Compatible phone models | Apple iOS 16.4 or higher, Android OS 11.0 or higher |
| Human interface input | Touchscreen |
| Compatible Devices | Smartphone |
| Connectivity Technology | Ethernet |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Warranty description | 1 year manufacturer |
| Supported Application | GPS, Phone |
| Warranty Type | Limited |
| Other details | |
| Gps Geotagging Functionality | Built-in GPS |
| Display type | AMOLED |
| Resolution | 348 x 442 |
| Wireless compability | Bluetooth |
| Metrics measured | Heart rate, SpO2, accelerometer, gyroscope, temperature, ambient light |
| Builtin media | Versa 4, Classic band (small and large), charging cable |
| Closure Type | Zipper |
| Communication Feature | True |
| Shape | Square |
| Sport Type | Fitness |
| Style Name | Modern |
| Target Audience | Unisex Adults |
| Water Resistance Level | Water Resistant |
| Waterproof Rating | IP67 |
| Wearable Computer Type | Smart Watch |
| Wireless Provider | Unlocked |
Closest rivals on specs
Trausi TG08 Smart Watch for Men- Screen Size 1.6 vs 1.8 inches (-11%)
- Warranty description 1 vs 0.25 years (+307%)
Garmin Venu Sq 2 GPS Smartwatch- Battery average life 6 vs 11 days (-45%)
- Band length 1.6 vs 6.2 inches (-74%)
CARBINOX Edge GPS Smart Watch Bundle- Battery average life 6 vs 15 days (-60%)
- Memory storage capacity 4 vs 1 GB (+300%)
- Band length 1.6 vs 10.3 inches (-84%)
Frequently asked questions
Does tracking blood oxygen drain the Fitbit Versa 4 battery faster?
Yes. The description says the SpO2 feature requires more frequent charging, and it adds that the feature is not for medical use.
Can I swim with the Fitbit Versa 4?
The listing gives water resistance to a depth of 50 meters. Care steps after salt or chlorine exposure are not described.
Is Fitbit Premium included with the Versa 4?
The title says a 3-month Google Health Premium membership is included. The description says a Premium membership is required for the Daily Readiness score.
What is in the box with the Fitbit Versa 4?
The listing names the watch, a Classic band in small and large sizes, and a charging cable.