Fitbit Flex
- Screen 0.5 inch LED display
- Battery life up to 5 days
- Water resistance 1 ATM
- Sensors 3-axis accelerometer, vibration motor
- Date May 2013
Specs
General
| Physical size | 15.2 x 10.2 mm (width/thickness) |
| Material | Stainless steel casing, elastomer strap. |
| Charging | USB |
| Battery | Lithium-polymer |
| Battery life | up to 5 days. Charge time (0-100%): Two hours. |
| Water resistance | 1 ATM |
| Weight | 36 grams |
| Display type | LED display |
| Display size | 0.5 inch |
| Color options | Black, Slate, Tangerine, Teal, Navy, Violet, Blue, Lime, Pink, Red |
Sensors
| Accelerometer | Yes |
| Barometric altimeter | No |
| Compass | No |
| Galvanic skin response | No |
| Geomagnetic | No |
| Gyroscope | No |
| Optical heart rate | No |
| Electrical heart rate | No |
| SpO2 | No |
| Temperature | No |
| GPS | No |
| GALILEO | No |
| GLONASS | No |
| QZSS | No |
| Beidou | No |
| Ambient light sensor | No |
| Vibration motor | Yes |
| Microphone | No |
| Speakers | No |
Health & activity tracking
| Steps | Yes |
| Distance | Yes |
| Calories burned | Yes |
| Sports tracking | Yes |
| Floors | No |
| Sleep | Yes |
| Heart rate | No |
| Stress | No |
| Blood oxygen | No |
| Respiration rate | No |
| UV exposure | No |
| Skin temperature | No |
| Hydration level | No |
| HRV | No |
| ECG | No |
| Calorie intake | No |
| Blood pressure | No |
| Glucose | No |
| Other | Auto sleep detection, silent wake alarm |
Daily smart features
| Smartphone notifications | Yes |
| Smartphone music control | No |
| On-board music storage | No |
| Connected pay | No |
| Cellular | No |
| Connectivity | Bluetooth |
| Operating system | FitbitOS |
| Memory | Saves 7 days of detailed motion data, minute by minute. Saves daily totals for the last 30 days. |
Disclaimer Note
These technical specs are correct to the best of our knowledge at the time of publishing.
