1.mi band 4 has two version(standard version and NFC version). And about the NFC, only “Analog door card” function will be working out of mainland China.

2.This item is standard version without NFC,if you want the NFC version,please stay focus on our website.Thank you for your supporting.
3. The product id of original Xiaomi mi band 4 watch charger cable is  1521328
4.User Guide: http://myosuploads3.banggood.com/products/20190613/20190613011217MiSmartBand42.pdf
 

Specification
Brand	Xiaomi
Model	Mi band 4(Chinese Version)
Color	Black
Bluetooth Version	BT 5.0
Compatible OS	Android 4.4 or above , iOS 9.0 or above
Operating Mode	Touch Screen
APP Name	Mi fit
Special Features
Waterproof	5ATM
Mobile Payment	Support
Heart Rate Monitor	Support
Blood Pressure Monitor	/
Blood Oxygen Monitor	/
Sleep Monitor	Support
Multi-sport Modes	Support (Swimming,Outdoor Run etc)
Call or Message Reminder	Support
Reject Call	Support
Notification	Support Facebook,Twitter,Wechat, WhatsApp etc.
Alert Type	Vibration
Auto Light-up Screen	Support
Stopwatch	Support
Other Functions	Support Pedometer,Alarm,Calender,Sedentary reminder,Camera remote control,Anti-lost
Technical Parameters
Sensor	Six G-sensor, Heart Rate Sensor
Screen	Size:0.95 Inch  Type:AMOLED                Resolution: 240*120pixels
Battery	Battery Capacity: 135mAh   Standby Time: About 20days  Using time: About 7days  Charging Time: About 2hours
Appearance & Details
Band	Material: Plastic + Alloy  Length: 155-216mm
		1*Xiaomi Mi band 4 Smart Bracelet
		1*Charging Cable
		1*User Manual
Tips: 1.Display and light of shoot will affect the color of the products, pictures for reference only, subject to our available products. 2.Please download the app before usage in order to compatible perfectly with your phone.

Q&A

1.Q. Is it waterproof ?
A. It’s 5ATM waterproof. 
 
2. Q. What is the APP?
A. It’s Mi fit.
 
3. Q. How to change the time of my device?
A. Please synchronize the device with your phone through Bluetooth to calibrate time.