| Display | Color OLED, 333 ppi, DCI-P3, Corning Gorilla Glass 3 | 1.2-inch always-on transflective touchscreen with mineral glass and a night mode |
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| Battery | Up to 16 hours (328 mAh typical); about 30 minutes to 60%, about 70 minutes to 100% | Up to 15 days of regular use; up to 38 hours of full GPS (standard GPS mode) |
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| Case | 41.04 x 44.89 x 13.35 mm, 28.03 g without band; band fits 120-200 mm wrists | — |
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| Water Resistance | Water resistant to 50 m | 5 ATM |
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| 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 | Bluetooth; syncs with Strava, Nike Run Club, Apple Health and Health Connect; notifications, Find My Phone, GoPro and Insta360 control |
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| Sensors | Accelerometer, optical heart rate sensor, altimeter, magnetometer, ambient light sensor, gyroscope | Optical heart rate and SpO2 sensor (5 LEDs, 4 photodetectors), barometric altimeter |
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| Audio | Built-in microphone and speaker | — |
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| Compatibility | Fitbit Ace app on Android 11 or newer or iOS 16 or newer | — |
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| Target age | Kids 7 and up | — |
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| Body | — | 11.7 mm thick; 30 g with nylon band; silicone and nylon band options; 20 mm quick-release bands |
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| Positioning | — | GPS with optional dual-frequency mode, barometric altimeter, breadcrumb and turn-by-turn navigation |
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| Sports | — | Run, bike, swim, strength and snow activity modes; training plans, workouts and COROS Training Hub |
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| Music | — | Built-in audio support for music (per COROS) |
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