One of the biggest improvements of Xiaomi Mi band 3 NFC version is the addition of NFC function, which presently supports for Beijing, Shenzhen, Guangzhou and other national 164 cities public travel services, and can be connected with Xiaomi, non-MIUI Android phones, Apple phones. 
Xiaomi Mi band 3 NFC adopts NXP PN80T safety NFC module. Currently, it supports public transportation, subway and partial access control functions. In the future, it will support functions such as wristband payment and smart door lock.
In addition to the above basic functions, 
Supports 5ATM grade waterproof, which can be worn in swimming, surfing and other scenes. At the same time, 
Supports the sports secondary screen. In the sports mode of Xiaomi Sports APP, open any of the four types of outdoor running, indoor running, outdoor riding and walking, you can exercise. During the process, the wrist is displayed to display the movement data without having to pull out the phone. And the user can set the heart rate setting value. After the heart rate exceeds this number, the Mi band will vibrate and alarm.
Touchscreen
Size：1.5 inches 
Bluetooth ：4.2
Resolution：128×80px