Design & Build
Dimensions: 43.27 × 32.49 × 10.80 mm (excluding heart‑rate sensor)
Weight: Approximately 24.5 grams without the strap.
Materials:
Frame made from aluminum alloy
Shell composed of high-strength fiber polymer
Cover material: 2.5D reinforced glass
Straps: Various strap options (TPU, leather/calfskin) depending on version. Compatible wrist circumference: 135–205 mm.
Display
Type & Size: 1.74‑inch AMOLED touch display.
Resolution: 336 × 480 pixels.
Brightness: Peak brightness up to 1200 nits, with automatic brightness adjustment.
Glass: Reinforced 2.5D glass.
Sensors, Tracking & Health Features
Sensors Included:
Accelerometer
Gyroscope
Electronic compass
Optical heart‑rate sensor
Pulse oximeter (SpO₂)
Ambient light sensor
Health Monitoring: Tracks heart rate, blood oxygen, sleep patterns, stress, women’s health, etc.
Sports / Activity Modes: Over 150 sports modes; some models offer 15 professional modes and auto‑recognition for certain activities.
Positioning / GPS: Built‑in GNSS support, covering multiple satellite systems like GPS, BeiDou, GLONASS, Galileo, QZSS.
Battery & Charging
Battery Capacity: 350 mAh.
Battery Life: Up to 21 days under typical/light usage. Modes such as Always‑On Display (AOD) reduce duration.
Charging Time: Approx. 75 minutes for a full charge (magnetic charging).
Water Resistance & Durability
Water Resistance Rating: 5 ATM (i.e. up to ~50 meters), suitable for swimming / shallow water, but not recommended for hot showers, saunas, or deep diving.
Connectivity & Compatibility
Bluetooth: Version 5.4
GNSS: As above, supports major global constellations
Operating System / App Compatibility: Works with Android 8.0 or newer, and iOS 12.0 or newer. Uses the Mi Fitness app for data sync and management.
Colors & Variants
Available colors include Obsidian Black, Rose Gold, Moonlight Silver, Cream White.
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Pros & Cons
Here are some of the strengths and weaknesses based on reviews and user feedback.
✅ Pros
High brightness display (1200 nits) makes it readable even in strong sunlight.
Long battery life under typical/light usage (up to ~21 days).
Strong tracking suite including heart rate, SpO₂, multiple sports modes, and built‑in GPS.
Solid build quality: nice materials, reinforced glass, good water resistance.
⚠️ Cons / Limitations
Heavy usage / Always‑On Display can significantly reduce battery life.
Lack of speaker & microphone means you can’t take calls directly from the band.
No physical home button, which some users might miss in wet or sweaty conditions.
Sleep tracking (especially deep sleep data) may be less accurate according to some user reports.
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Conclusion
The Xiaomi Smart Band 9 Pro is a feature‑rich smart fitness band that strikes a strong balance between durability, display quality, health tracking features, and battery life. If you are looking for a wearable that can do serious fitness & health tracking with built‑in GPS, long battery, and a bright screen, the 9 Pro is a solid option.
However, if your top priorities are talking through the device, replying to notifications, or super accurate sleep data, then you might want to compare with some smartwatches or wait for future generations.
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If you like, I can write a short summary of these specs or compare it with other bands (e.g. Band 8, or competitors) so you can see what’s better/worse. Do you want that?