Fitbit Sense 2 Smart Watch - Shadow Grey/Graphite
- Keep Stress in check
- Sleep Insights
- Water Resistant & Swimproof
- Built-in GPS
- 6+ hours Battery life
Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Plus, continuous tracking of your heart & activity lets you track your overall wellness and dive deep into your health & fitness with the included 6-month Premium membership.
Keep stress in check
Managing stress can lead to better sleep & more energy. Get smart reminders to reflect on signs of stress in your body with a new continuous EDA sensor while actively managing them with exercise, deep breathing & more.
Make sense of your sleep
Learn how to maximise rest with tools that track your sleep quality and pinpoint areas you can focus on improving. Premium gives you even more insights—see a personalised analysis of your sleep each month and get matched with a sleep animal that most closely mirrors your sleep style.
Watch your well-being
Track key health metrics like blood oxygen (SpO2) & heart rate variability to help illuminate changes in your wellness so you can adjust your routine to better support your health.
Fitbit FB521BKGB| Display | |
|---|---|
| Always-on display | Y |
| Colour display | Y |
| Touchscreen | Y |
| Display type | Digital |
| Performance | |
|---|---|
| Mobile operating systems supported | Android, iOS |
| FM radio | N |
| Built-in camera | N |
| Built-in speaker(s) | Y |
| Built-in microphone | Y |
| Design | |
|---|---|
| Waterproof up to | 50 m |
| Protection features | Water resistant |
| Closure type | Single prong strap buckle |
| Waterproof | Y |
| Suggested gender | Unisex |
| Maximum strap length | 20.9 cm |
| Minimum strap length | 12.9 cm |
| Wrist size range | 129 - 209 mm |
| Shape | Square |
| Band size | S/L |
| Band colour | Black |
| Watch case material | Aluminium |
| Watch case colour | Black |
| Market positioning | Smartwatch |
| Features | |
|---|---|
| Altimeter | Y |
| Vibrating alarm clock | Y |
| Thermometer | Y |
| Virtual assistant | Amazon Alexa |
| Ambient light sensor | Y |
| Skin temperature sensor | Y |
| Smart notifications | Y |
| SMS notifications | Y |
| Answerphone remote access | Y |
| Call notifications | Y |
| Advanced workouts | Y |
| Automatic daily activity detection | Y |
| Find my phone function | Y |
| Workout tracking | Y |
| Alarm clock | Y |
| Vibrating motor | Y |
| Short Message Service (SMS) | Y |
| Quality of sleep | Y |
| Activity tracker | Y |
| Accelerometer | Y |
| Calories burned | Y |
| Distance travelled | Y |
| Blood oxygen sensor | Y |
| Blood pressure monitor | Y |
| Heart rate sensor type | Optical |
| Heart rate monitor | Y |
| Network | |
|---|---|
| GLONASS | Y |
| GPS (satellite) | Y |
| Mobile network connection | N |
| Ports & interfaces | |
|---|---|
| Headphone connectivity | Bluetooth |
| Near Field Communication (NFC) | Y |
| Bluetooth Low Energy (BLE) | Y |
| Bluetooth version | 5.0 |
| Wi-Fi | N |
| Bluetooth | Y |
| USB port | N |
| Power | |
|---|---|
| Charging time | 2 h |
| Battery life | 144 h |
| Battery life (GPS mode) | 5 h |
| Battery life | 6 day(s) |
| Battery life (max) | 144 h |
| Battery type | Built-in battery |
| Battery technology | Lithium Polymer (LiPo) |
| Operational conditions | |
|---|---|
| Operating temperature (T-T) | -10 - 45 °C |
| Weight & dimensions | |
|---|---|
| Thickness | 1.23 cm |
| Depth | 40.5 mm |
| Width | 40.5 mm |
| Packaging content | |
|---|---|
| Charger | Y |
