Main Features: 

0.78 inch OLED Touch Screen 
Bigger screen, fit the width of the wrist, bring pleasant feeling of wearing. Big screen display a comprehensive and rich information, raise the wrist, efficiency is obvious.
 
Feature With 5ATM Water Resistant Rating
One of the things that set the Mi Band 3 apart from many other feature-laden smartwatches available is its 5ATM water resistant rating - withstands pressures equivalent to a depth of 50 meters, making it a charm when being exposed in rain, splashing, accidental submersion, showering, surface, swimming.
 
Raise Wrist To Wake Up The Screen
Raise your hand to brighten the screen without taping screen to see real-time states including sports data, time and heart rate.
 
Heart Rate Monitor
It can accurately monitor pulses and active and resting heart rate changes to generate a professional heart rate report.
 
Notification Display  & Reject Phone Calls
While Bluetooth connecting, if there is an incoming call, it would show the caller ID. Almost notification of APPs could be synchronized to the watch.
 
Pedometer / Sleep Monitoring / Sedentary Reminder
Mi Band 3 helps you record all your activities in the day,calculate the distance you walk and calories burned,take care of your health, monitor your sleep, remind you to have a rest and track your steps, mileage and calories for high quality sports
 
Long standby time
Xiaomi mi band 3 with ensures about 20 days ultra-long standby time for a full charging.
 
General Specification
  Brand
 Xiaomi
  Model
 MI Band 3
  Color
 Black, Red, Blue
  Compatible OS
 Android 4.4 / iOS 9.0 or above
  Operating Mode
 Touch
  Bluetooth Version
 V4.0 or above
  Weight
 20g
  Size
 Adjustable length: 155-216 mm
 Product size (L x W x H): 46.9 x 17.9 x 12 mm
  APP
 MI app
Special Features
  Waterproof
 5ATM
  Heart Rate Monitor
 Support 
  Sleep Monitor
 Support 
  Pedometer
 Support 
  Exercise Plan
 Support 
  Caller or Message Show
 Support 
  Calories 
 Support 
  Distance Recording
 Support 
  Sedentary reminder
 Support 
Technical Parameters
  Sreen
 Size: 0.78 inch 
 Type: OLED Touch Display              
 Resolution: 128*80
  Battery
 Battery Capacity: 110mAh
 Standby Time: About 20 days
  Band
 Material: Mi-core material: Plastic + Alloy
                Case material: TPEE
                Band material: TPSiV
 Length: Adjustable length: 155-216 mm
 
Package  Included:
1*Xiaomi Band 3 
 1*Charger 
 1*User Manual