| Display | Color OLED, 333 ppi, DCI-P3, Corning Gorilla Glass 3 | Always-On display; cover glass 4x more resistant to cracks than previous generation (Ion-X) |
|---|
| Battery | Up to 16 hours (328 mAh typical); about 30 minutes to 60%, about 70 minutes to 100% | Up to 18 hours; 15 minutes of fast charging adds up to 8 hours, about 80% in 45 minutes |
|---|
| Case | 41.04 x 44.89 x 13.35 mm, 28.03 g without band; band fits 120-200 mm wrists | — |
|---|
| Water Resistance | Water resistant to 50 m | — |
|---|
| Connectivity | Built-in 4G LTE (Fitbit Ace Pass subscription required), Wi-Fi 802.11 b/g/n 2.4GHz, Bluetooth 5.0, NFC (Tap to Pay), GPS/GNSS | 5G cellular models |
|---|
| Sensors | Accelerometer, optical heart rate sensor, altimeter, magnetometer, ambient light sensor, gyroscope | — |
|---|
| Audio | Built-in microphone and speaker | — |
|---|
| Compatibility | Fitbit Ace app on Android 11 or newer or iOS 16 or newer | — |
|---|
| Target age | Kids 7 and up | — |
|---|
| Case Size | — | 40mm / 44mm aluminium (midnight, starlight) |
|---|
| Chipset | — | Apple S10 |
|---|
| Health Sensors | — | Heart rate, wrist temperature sensing, sleep score, sleep apnea notifications, retrospective ovulation estimates |
|---|
| OS | — | watchOS 26 (requires iPhone 11 or later with iOS 26) |
|---|
