| Display | Color OLED, 333 ppi, DCI-P3, Corning Gorilla Glass 3 | 1.2-inch AMOLED touchscreen with tapered edge and automatic brightness (COROS cites 164% higher resolution than PACE 3) |
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| Battery | Up to 16 hours (328 mAh typical); about 30 minutes to 60%, about 70 minutes to 100% | Up to 19 days of daily use; up to 41 hours of GPS in All Systems (High) 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 | — |
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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 | — |
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| Sensors | Accelerometer, optical heart rate sensor, altimeter, magnetometer, ambient light sensor, gyroscope | Redesigned optical heart rate sensor with larger LEDs, built-in microphone |
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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 | — | 11.8 mm thick; 32 g with nylon band, 40 g with silicone band; Standard White version with fiber-reinforced polymer bezel; Black Crystal and Cloud White versions with aluminum alloy bezel |
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| Positioning | — | All-Systems and Dual-Frequency satellite modes |
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| Controls | — | Touchscreen, two buttons and a tactile digital dial, plus an Action Button for data screens, media controls, breadcrumb navigation and Voice Pins |
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| Charging | — | USB-C charging adapter (cable not included) |
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| Bands | — | Interchangeable silicone or nylon bands |
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| Sports | — | Running fitness scores and tests, race predictions, personalized marathon plans, Virtual Pacer, Effort Pace, real-time activity alerts |
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| Health | — | HRV, sleep, recovery time and menstrual cycle tracking |
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| Media | — | On-watch media controls for skipping tracks or podcasts and adjusting volume |
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