# Smartwatch Fitbit Sense 2

**URL:** https://aio.lv/en/product--fitbit-fb521srwt--5061302
**Data updated:** 2026-01-08 13:41 (EET)
**Category:** Smartwatches & Fitness Bands
**Manufacturer:** Fitbit
**Manufacturer code:** FB521SRWT
**EAN:** 810038858371
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

The Fitbit Sense 2 is a feature-rich smartwatch with a digital touchscreen and GPS. Weighing 200g, it is waterproof up to 50m and comes with a white band in S/L size. Powered by Fitbit OS, it offers advanced health tracking and fitness features, making it ideal for active users.

## Long description

The Fitbit Sense 2 is a feature-rich smartwatch with a digital touchscreen and integrated GPS, offering advanced health and fitness tracking in a lightweight, water-resistant aluminium case with a white S/L band. It monitors body responses and heart activity throughout the day and pairs with Fitbit OS for guided breathing, exercise, sleep analysis and smartwatch conveniences such as Google Maps turn-by-turn directions and Google Wallet payments.
Advantages
All-day body response tracking detects patterns of stress and provides smart notifications to prompt reflection and use of breathing exercises, meditations or workouts. Detailed sleep analytics including a monthly Sleep Profile and a nightly Sleep Score offer breakdowns of light, deep and REM sleep (Fitbit Premium required for some features). Heart monitoring includes continuous heart rate tracking, on-demand ECG for atrial fibrillation assessment and irregular rhythm notifications. Daily Readiness Score combines recent activity, sleep and heart rate variability to help decide whether to train or recover. Built-in GPS, water resistance to 50 m and compatibility with Google Maps and Google Wallet add practical everyday functionality.
Suitable for
Users who want continuous stress and body response monitoring
People seeking detailed sleep analysis and improvement tips
Those who need ECG and heart-rate-based notifications
Active users who want workout guidance and a Daily Readiness Score
Anyone wanting smartwatch features like GPS navigation and contactless payments
Key specifications
Brand: Fitbit; Model: Sense 2 (FB521SRWT)
Operating system: Fitbit OS
Connectivity: Bluetooth (no Wi‑Fi, no mobile network)
Case material and colour: Aluminium, aluminium colour
Band: White, S/L size
Water resistance: up to 50 m
Weight: 0.2 kg
Features: all-day body response tracking, ECG app, irregular rhythm notifications, continuous heart rate, Sleep Profile and Sleep Score, Daily Readiness Score, built-in GPS, Google Maps, Google Wallet
EAN: 810038858371
How to use
Wear the Fitbit Sense 2 on your wrist and pair it with the Fitbit app on a compatible smartphone. Use the body response and stress tracking to monitor daily patterns; follow guided breathing or meditation sessions directly on the watch when prompted. Enable the ECG app for on-demand atrial fibrillation checks and turn on irregular heart rhythm notifications to receive alerts while still or sleeping. Access Sleep Profile and Sleep Score via the Fitbit app or Fitbit Premium to review monthly sleep trends and nightly breakdowns. Use the built-in GPS for outdoor workouts and Google Maps for turn-by-turn directions; add cards to Google Wallet for contactless payments from the watch.
Usage recommendations
For reliable health insights, wear the watch consistently (including during sleep), keep firmware and the Fitbit app updated, and enable relevant notifications and permissions. Consult a medical professional for any concerning heart alerts or health changes detected by the device.

## Specifications

### Display

| Feature | Value |
|---|---|
| Touchscreen | Yes |
| Display type | Digital |
| Watch glass type | Corning Gorilla Glass 3 |
| Colour display | Yes |
| Always-on display | Yes |

### Design

| Feature | Value |
|---|---|
| Shape | Square |
| Watch case material | Aluminium |
| Watch case colour | Aluminium |
| Band colour | White |
| Product colour | Platinum, White |
| Waterproof | Yes |
| Closure type | Single prong strap buckle |
| Maximum strap length | 209 mm |
| Wrist size range | 129 - 209 |
| Band size | S/L |
| Suggested gender | Unisex |
| Removable strap | Yes |
| Waterproof up to | 50 m |
| Protection features | Water resistant |
| Market positioning | Smartwatch |
| Minimum strap length | 129 mm |

### Ports & interfaces

| Feature | Value |
|---|---|
| Bluetooth version | 5.0 |
| Bluetooth | Yes |
| Wi-Fi | No |
| Headphone connectivity | Bluetooth |
| Near Field Communication (NFC) | Yes |
| USB port | No |

### Network

| Feature | Value |
|---|---|
| Mobile network connection | No |
| GPS (satellite) | Yes |
| GLONASS | Yes |

### Power

| Feature | Value |
|---|---|
| Battery life | 144 h |
| Battery type | Built-in battery |
| Charging time | 2 h |
| Battery life (GPS mode) | 5 h |
| Battery life (max) | 144 h |
| Battery life | 6 day(s) |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.2 kg |
| Width | 91 mm |
| Depth | 176 mm |
| Thickness | 66 mm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | -10 - 45 |

### Packaging data

| Feature | Value |
|---|---|
| Package depth | 219 mm |
| Package height | 369 mm |
| Package width | 194 mm |

### Packaging content

| Feature | Value |
|---|---|
| Charging base | Yes |
| Charger | Yes |

### Performance

| Feature | Value |
|---|---|
| Built-in microphone | Yes |
| FM radio | No |
| Built-in speaker(s) | Yes |
| Operating system installed | Fitbit OS |
| Built-in camera | No |
| Mobile operating systems supported | iOS, Android |

### Battery

| Feature | Value |
|---|---|
| Battery technology | Lithium Polymer (LiPo) |
| Rechargeable battery | Yes |

### Features

| Feature | Value |
|---|---|
| Short Message Service (SMS) | Yes |
| Country of origin | United Kingdom |
| Alarm clock | Yes |
| Answerphone remote access | Yes |
| Thermometer | Yes |
| Heart rate monitor | Yes |
| Advanced workouts | Yes |
| Altimeter | Yes |
| Ambient light sensor | Yes |
| Accelerometer | Yes |
| Automatic daily activity detection | Yes |
| Vibrating motor | Yes |
| Find my phone function | Yes |
| Calories burned | Yes |
| Distance travelled | Yes |
| Quality of sleep | Yes |
| Workout tracking | Yes |
| Smart notifications | Yes |
| Call notifications | Yes |
| SMS notifications | Yes |
| Virtual assistant | Amazon Alexa |
| Blood pressure monitor | Yes |
| Activity tracker | Yes |
| Heart rate sensor type | Optical |
| Vibrating alarm clock | Yes |
| Blood oxygen sensor | Yes |
| Skin temperature sensor | Yes |

### Logistics data

| Feature | Value |
|---|---|
| Harmonized System (HS) code | 8517620000 |

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Fitbit products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Fitbit service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: shape, bluetooth, wi-fi, mobile network connection, weight, watch case material, watch case colour, band colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

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