Feature
1. 50 meters waterproof: waterproof level 5ATM (equivalent to 50 meters underwater). It can be worn in swimming pools, shallow water swimming and other shallow water activities, but it is not suitable for hot baths, saunas and deep diving. Water activities should avoid direct impact of high-speed water flow: the waterproof function is not permanent and may weaken over time.
2. The peak brightness of the AMOLED display reaches 1200nits, and information is still easily visible under strong sunlight. Equipped with a photosensitive module, it accurately senses ambient light and intelligently adjusts the display brightness for a more comfortable viewing experience.
3. High-precision sensors monitor data more accurately. Support automatic monitoring of heart rate, blood oxygen saturation detection and pressure monitoring.
4. Through high-precision sensors, accurate monitoring and data recording and analysis of sleep are carried out, and professional organizations are teamed up to provide more sleep suggestions to further improve your sleep quality.
5. Thanks to the professional low-power sensor and intelligent power consumption algorithm, Xiaomi Mi Band 9 has achieved a breakthrough of 21 days of long battery life under normal use.

Specifications
1. Weight: about 15.8g (without wristband)
2. Size: 46.53x21.63x10.95 mm
3. Screen size and type: 1.62-inch AMOLED screen
4. Screen resolution: 192x490, supports full-screen touch operation
5. Screen brightness: 1200nit, supports automatic brightness adjustment
6. Cover material: 2.5D tempered glass cover
7. Shell material: aluminum alloy middle frame + fiber high-strength polymer
8. Sensor: accelerometer, gyroscope sensor, optical heart rate and blood oxygen sensor, ambient light sensor
9. Waterproof level: 5ATM
10. Wireless connection: Bluetooth 5.4
11. Vibration motor: linear motor
12. Battery capacity: 233mAh
13. Charging time: about 60min
14. Adjustable length of wristband: 135-210mm, material: TPU
15. System language: Simplified Chinese, Traditional Chinese, English
16. Supported systems: Android 8.0 or iOS 12.0 and above
17. Supporting APP: Xiaomi Sports Health