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Feature

Fitness Tracker: Records your steps, distance, pace, calories burned and active minutes through monitoring your activity levels, sleep patterns etc.Furthermore, it will sync the data via Bluetooth 4.0 to the Mi Fit app to make a better understanding of sports and offer scientific guidance to reach a fitness healthier life
Smart Reminder: Vibrates to notify you when your phone receives a call, message or other notifications from apps such as Facebook, WhatsApp, and Instagram etc.tips:if there is a calling comes while meeting or class,instead of a series actions to take your phone to reject the call.you can easily click the bracelets twice to turn it off
Sleep Monitor: Monitors your whole sleep cycle, recognizes your stage of sleep,light or deep pattern,records data and analyzes your data to improve your sleep quality.
IP67 Water-Resistant Wristband Watch: Durable and resistant against water splashes, sweat, cosmetics and harmful dust.you can wear it while washing,showing,cleaning or other daily activities
Compatibility & Warranty: support for Bluetooth 4.0 and above, Android 4.4 and above and IOS 7.1 and above, including most smart phones in marketing. Tips: This item is in English Version, and support for 12-month warranty.

Description

Specs
Battery capacity:70mAh
Standby time:23 days
Battery type:Lithium polymer
Input current:45 mA (typ) 65mA (max)
Weight7.0g
Water-resistanceIP67
Configuration0.42" OLED display
Bluetooth 4.0 BLE
Power-efficient accelerometer Band
Total length:235 mm
Adjustable length:155-210 mm
Material: Thermoplastic elastomer, aluminum alloy

Compatibility
Devices with Android 4.4, iOS 7.0 or above with Bluetooth 4.0 support, such as iPhone models 4s and later.

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

Q: What are the new features of Mi Band 2?
A: Mi Band 2 analyze sleep quality and measure your heart rate. It can also count steps, monitor heart rate and calories burned while you are running.
Moreover, you can set silent alarms and receive app alerts on your band, as well as unlock your Android phone using Mi Band.

Q: What might influence the heart rate measurements?
A: The following factors might influence the heart rate measurements:
- The light that gets between your skin and the sensor
- The band movement when it is not fastened tight enough
- When your arms are lifted too high
Tip: when measuring the heart rate, make sure you stay calm with your arms relaxed and the band fastened properly.
Note: Skin tone, hair, tattoos and scars might also influence the results of the measurement.

Q: What's the battery capacity ? How long will I be able to use it once it's fully charged?
A: Mi Band has the battery with the capacity of 70mAh. It will last for about 20 days when the Sleep assistant feature is off. When the battery is full and Sleep assistant is on, the Battery will last around 15 days.
Remember that this numbers aren't precise and depend on how you use your band.

Q: How large a wrist can this fit on?
A: 155-210 mm (6.1 inch - 8.2 inch)