Weight & dimensions | Width | 40.5 mm |
 | Depth | 40.5 mm |
| Thickness | 11.2 mm |
Network | GPS (satellite) | Yes |
| GLONASS | Yes |
Operational conditions | Operating temperature (T-T) | -10 - 45 °C |
Ports & interfaces | Bluetooth version | 5.0 |
| Near Field Communication (NFC) | Yes |
| Headphone connectivity | Bluetooth |
| Bluetooth | Yes |
| Bluetooth Low Energy (BLE) | Yes |
Performance | Built-in microphone | Yes |
| Built-in speaker(s) | Yes |
| Mobile operating systems supported | Android, iOS |
| Operating system installed | Fitbit OS |
Display | Display type | Digital |
| Touchscreen | Yes |
| Always-on display | Yes |
| Colour display | Yes |
Design | Market positioning | Smartwatch |
| Watch case colour | Platinum |
| Watch case material | Aluminium |
| Band colour | Blue |
| Band size | S/L |
| Shape | Square |
| Wrist size range | 129 - 209 mm |
| Minimum strap length | 129 mm |
| Maximum strap length | 209 mm |
| Suggested gender | Unisex |
| Waterproof | Yes |
| Closure type | Single prong strap buckle |
| Protection features | Water resistant |
| Removable strap | Yes |
| Magnetic charging connector | Yes |
| Waterproof up to | 50 m |
Power | Battery type | Built-in battery |
| Battery technology | Lithium Polymer (LiPo) |
| Battery life (max) | 144 h |
| Battery life | 6 day(s) |
| | 144 h |
| Charging time | 2 h |
Features | Heart rate monitor | Yes |
| Heart rate sensor type | Optical |
| Blood pressure monitor | Yes |
| Blood oxygen sensor | Yes |
| Distance travelled | Yes |
| Calories burned | Yes |
| Accelerometer | Yes |
| Activity tracker | Yes |
| Personal goals | Yes |
| Quality of sleep | Yes |
| Short Message Service (SMS) | Yes |
| Vibrating motor | Yes |
| Ambient light sensor | Yes |
| Virtual assistant | Amazon Alexa |
| Smart notifications | Yes |
| Answerphone remote access | Yes |
| SMS notifications | Yes |
| Skin temperature sensor | Yes |
| Stress monitoring function | Yes |
| Barometric altimeter | Yes |
| Alarm clock | Yes |
| Advanced workouts | Yes |
| Automatic daily activity detection | Yes |
| Find my phone function | Yes |
| Workout tracking | Yes |
| Call notifications | Yes |
| Altimeter | Yes |
| Vibrating alarm clock | Yes |
Packaging content | Charger | Yes |