Xiaomi Mi Band 1S Main Features:
Heart rate monitor: 1S with optical heart rate sensor, shows you heart rate with PPG, you can see the results more intuitively.
30 days standby time: Top-level Bluetooth chip and military gravity sensor ensure 30 days ultra-long standby time for a full charging.
Call reminder: Mi Band 1S will tell you when a call comes, you never need to worry about missing any important calls.
Sports tracking: Track your sports, record steps, distance and calories, help you achieve your sports target.
Sleep monitoring: Let you know your deep sleep and shallow sleep, also APP will give you periodical evaluation, help you develop good living habits.
Silent alarm: Wake you up every morning, will not be late for work; Remind you with vibration, never worry about missing anything.
Free password to unlock the phone: Forget complex unlock password and gesture, simply raise your hand to close to phones, immediate and safe unlocking.

Xiaomi Mi Band 1S Specifications:
Model: new version Miband
Sensor: Photoelectric heart rate sensor(PPG), ADI gravity sensor
Bluetooth: Dialog Bluetooth chipset, V4.0
Input Voltage : DC 5.0V
Battery Capacity : 41mAh
Standby Time: 10days
Cell Type : Lithium Polymer
Input Current : 25mAh (TYP)
Alloy Body Dimension : 37*13.6*9.9 mm, 5.5g
Alloy Body Shell Material : Polycarbonate
Wrist Strap Material : DowCorning TPSiV
Adjustable length: 157~205mm
Waterproof: IP67
Metal Face Material : Magnesium Aluminum Alloy
Weight: 5.5g
Color: black
Package size: 96 x 96 x 32mm
Package contains:
1 x MI 1S Wristband
1 x USB Cable

Compatibility: Android 4.4 or above with Bluetooth 4.0, iOS 7.0 or above
Screen unlock function: MIUI6 or above; Android 5.0 or above with Bluetooth 4.0
App name: Mi Fit; directly search and download at Play Store or Apple Store