Specifications:

1. 100% original Xiaomi mi band 2 

2 .0.42inch OLED display screen with touchpad

3. Support Heart rate  monitor

4. Passometer,Fitness Tracker,Sleep Tracker,Message Reminder,Call Reminder

5. Water resistant (IP67)

6. 20-day standby power

7. Sleep-cycle smart alarm

8. With a Dialog II 4.0 bluetooth chip, ADI sensor

9. Running MIUI Android 4.4 and above versions; For iphone 4s/5/5s/6/plus ios 7.0 and above

10.Unlock your Mi phone without a password

11. Stylish band options (incl. wrap-around and leather)

12. Wrist Strap Length 235mm       Adjustable Wrist Strap Length 155mm ~ 210mm

  

Compatible Minimum Requirements:

1.Requires Bluetooth 4.0.

2.Compatible with Mi 3, Redmi Note 4G, or any device with Android 4.4 and above.

3.Compatible with iPhone models 4s and above that run on iOS 7.0 and above. 

      For IOS devices : iPhone 4s / 5 / 5c / 5s / 6 / 6 Plus /  6s 6s plus

  

For smart unlock features:

1.Xiaomi (MIUI 6 and above): Mi2/2S/2A, Mi3, Mi4, Mi Note, Mi4C, Redmi 1S, Redmi 2/2A, Redmi Note, Redmi Note2  Note3,

   xiaomi MI5 4S    XIAOMI MAX

2.Note: Mi Band's phone unlocking feature requires smartphones with MIUI or Android 5.0 and above.