he product has Heart Rate Monitor, Activity Tracking, Colorful Breathing Light, Sleep Monitor, Sefie, Call Notification, Message Notification Clock Alarm Sedentary Alarm functions. It is very convenient for your life.

Features:
You must connect phone through Bluetooth before use.
For Android 4.4 iOS 8.0 Bluetooth 4.0 or Above smartphones.
Heart Rate Monitor: The product with optical heart rate sensor, detect real time heart rate and give you useful tips when you do some exercise, catch accurate heart rate.
Colorful Breathing Light: At a glance of different activity status, scientific fitness.
Call Notification: Breathing light + vibration dual remind, display with coming call name and phone number.
Slight lift your hands, comfortable without pressure: Gesture wake up, lift your hand to watch time.
APP professional data analysis.
Touch button: Tracking your record in real time, scientifically plan your sport.
It also has Sefie, Call Notification, Message Notification, Clock Alarm, Sedentary Alarm, etc.
As a smartphone companion and sports partner, it is the best product for yourself and your friends.   
Perfect design, convenient to take along.

Note:
Before you use it, you must download APP(sma).
Before you purchase, you must confirm the band length suitable to you or not.

Specifications:  
Brand: SMA
Color: Black, Black + Red (Optional)      
Bluetooth: 4.0
Battery: 80mAh 
Band material: TPU
The band length: 23cm 
Product size: Approx. 23 * 1.8 * 1cm / 9.1 * 0.7 * 0.4oz
Product weight: Approx. 22g / 0.77oz
Package size: Approx. 11 * 6.5 * 6.5cm / 4.3 * 2.6 * 2.6in
Package weight: Approx. 71g / 2.5oz

Package list:  PA3649
1 * Smart band
1 * User manual(English)