Miband 1S Miband Light-sensitive Version Smart Bracelet with heart rate monitor is an advanced smart bracelet from Xiaomi with lots of useful features. Mi Band connects to your smartphone via Bluetooth and can work for 30 days with no need to recharge.

This new modification of Mi Band has a new feature — the heart rate monitor.

During and after aerobic exercises the heart rate sensor allows you to control the pace, the heart rate, to handle the state of your movement at every moment.

Military-grade exercise sensor - Manufactured by US-based ADI, Mi Band’s accelerometer has the lowest power consumption of any comparable sensor. Its power consumption is less than one-fifth than that of similar accelerometers.

World-class Bluetooth® 4.0 chip - The DA14580 low-energy Bluetooth® 4.0 chip manufactured by Dialog can run for over 4 years on a single 225mAh button power cell. This incredibly low energy consumption means Mi Band can go up to 30 days between charges.

Ultra-thin 8mm battery - At 8mm, Mi Band's 41 mAh battery is extremely thin and powerful. One full charge can last you 30 days - that's 4 times longer than other fitness bands.

Tested to be tougher!

High-temperature testing - Subjected to temperatures of 70℃ for 128 hours continuously.
Low-temperature testing - Subjected to temperatures of -20℃ for 128 hours continuously.

Drop testing - Dropped 12 times on marble surface from a height of 1.2m.

Cosmetic resistance testing - Smeared with petroleum jelly and left for 24 hours

Functions:
Pedometer
Fitness Level Monitor
Sleep Cycle & Quality Monitoring - Tracks how much quality sleep you have, deep sleep, light sleep, even record the time you get to bed and wake up.
Smart Alarm Clock
SMS & Phone reminders
Historical Data - Keeps records of your sleep, distance walked/jogged, calories consumed so you can monitor your fitness progress weeks or months later.
MI Band locating function
LED Light color setting
Total distance display
Average daily steps
Share via Social Media
MIUI Unlock - adds a new layer of phone security with it's phone unlocking feature! (For Xiaomi phones)
Battery capacity and life:
41mAh lithium polymer battery
Standby time: About 30 days

Compatibility:
Mi 4, Mi 3, Redmi Note 4G, or any device with Android 4.4 and above
iPhone models 4s and above that run on iOS 7.0 and above

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

Material:
Surface: Aluminium
Shell: Makrolon
Wristband Button: Aluminium
Wristband: IPSiV
Size:
Sensor: 37 x 13.6 x 9.9 mm
Wristband length: adjustable between 157mm and 205mm
Weight: 5.5g
Color: Black

Package:
1 x Mi Band Pulse with Heart Rate Sensor
1 x Band
1 x Charger
1 x English Manual