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Price and Release Date | 
| Suggested Price | $799 | $199 | $324 | $230 | $155 | $299 | 
| Release / Update | 2023 | 2017 | 2020 | 2020 | 2017 | 2023 | 
Activity & Fitness | 
| Calories |  |  |  |  |  |  | 
| Distance |  |  |  |  |  |  | 
| Heart | Third-generation optical heart sensor |  |  |  |  |  | 
| VO2max (Oxygen) |  |  |  |  |  |  | 
| Sleep |  |  |  |  |  |  | 
| Steps |  |  |  |  |  |  | 
| Stress mgt |  |  |  |  |  |  | 
| Female health |  |  |  |  |  |  | 
| Skin temp |  |  |  |  |  |  | 
| Breath rate |  |  |  |  |  |  | 
Battery | 
| Duration | Up to 36 hours normal use, Up to 72 hours in Low Power Mode | 18 hours | 6 Days | 6 Days | 5 months | Up to 11 days in smartwatch mode, 5 days with Always-on display, 21 days in battery saver mode, up to 21 hours in GPS mode | 
| Rechargeable |  |  |  |  |  |  | 
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Compatibility Support | 
| Android |  |  |  |  |  |  | 
| iOS |  |  |  |  |  |  | 
| Windows Phone |  |  |  |  |  |  | 
| Mac |  |  |  |  |  |  | 
| Windows |  |  |  |  |  |  | 
Connectivity Support | 
| Bluetooth |  |  |  |  |  |  | 
| Cellular |  |  |  |  |  |  | 
| GPS |  |  |  |  |  |  | 
| NFC |  |  |  |  |  |  | 
| Wi-Fi |  |  |  |  |  |  | 
Display | 
| Color |  |  |  |  |  |  | 
| Resolution | 502 x 410 pixels | 340 x 272 or 390 x 312 | 360 x 360 | 336 x 336 |  | 390 x 390 pixels | 
| Size | 49mm | 1.5 inches or 1.65 inches | 1.58 inches | 1.58 inches |  | 1.2" | 
| Touch |  |  |  |  |  |  | 
| Type | Always-On Retina LTPO OLED | AMOLED | AMOLED | AMOLED |  | AMOLED | 
Functions | 
| Audio Speaker |  |  |  |  |  |  | 
| Clock |  |  |  |  |  |  | 
| Phone |  |  |  |  |  |  | 
| Vibration |  |  |  |  |  |  | 
| Voice |  |  |  |  |  |  | 
Hardware | 
| Accelerometer |  |  |  |  |  |  | 
| Barometer or Altimeter |  |  |  |  |  |  | 
| Ultraviolet Sensor |  |  |  |  |  |  | 
| Water Resistance | Water resistance 100m, Dust resistance IP6X, EN13319 recreational scuba diving to 40m, Tested to MIL-STD 810H | 5 ATM | 5 ATM | 5 ATM | 5 ATM | 5 ATM (50 Meters) | 
Notifications | 
| Phone |  |  |  |  |  |  | 
| Emails |  |  |  |  |  |  | 
| Texts |  |  |  |  |  |  | 
Software | 
| Operating System | WatchOS 10 | WatchOS 4 | Fitbit OS | Fitbit OS |  | Garmin Watch OS | 
| Apps |  |  |  |  |  |  | 
| Music |  |  |  |  |  |  | 
More Information | 
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