| Fitbit Charge 4 | |
 | |
| Tech specs | |
| Size | Device Dimensions: 42.7mm x 28.8mm x 12.5mm One size (small and large bands included) |
| Material | Built of more lightweight material including an aerospace grade aluminum case and Corning Gorilla Glass 3 display. The housing and buckle are made of anodized aluminum. |
| Charging | USB |
| Battery | Lithium-polymer |
| Battery life | up to 7 days, or up to 5 hours with GPS. |
| Water-resistance | 5 ATM |
| Weight | 30 grams |
| Sensor | 3-axis accelerometer, Optical heart rate monitor, Pulse Ox, GPS, Vibration motor, NFC chip for Fitbit Pay, Altimeter, Bluetooth LE (BLE) |
| Display | OLED full touchscreen, TFT |
| Screen size | 35.8mm x 22.7mm |
| Colors | Multiple |
| Other | Charge 4 stores your stats and data for 7 days in between the times you sync your tracker. |
| Activity tracking | |
| Steps | Yes |
| Distance | Yes |
| Calories burned | Yes |
| Activity | Yes |
| Floors | Yes |
| Sleep | Yes |
| Heart rate | 24/7 + HRV (premium subscription) |
| Stress & recovery | |
| Pulse Ox | Yes |
| Respiration rate | Yes (premium subscription) |
| UV exposure | |
| Skin temperature | |
| Galvanic skin response | |
| Hydration level | |
| Calorie intake | |
| GPS | Yes |
| Running features | |
| Swimming features | |
| Other | Guided breathing, Female Health Tracking, Spotify control |
| Non-fitness functions | |
| Smartphone notifications | Yes |
| On-board music storage | |
| Connected pay | Yes |
| LTE | |
| Links | |
| Affiliate link* | Amazon | Fitbit |
| Read more | Review |
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.