Please read the product description before purchase.Syncs:iPhone,iPad must be iOS6.1 or above and most Android Smartphones(Android 4.3 or higher);
Analyze your sleep quality within a period of time,and it will vibrate to wake you up in the quite morning;
Record your walking and running data;Calculate personal calories burnt and distance walked according to your height, weight and speed;
OLED display: steps, caloreis, time, distance and remaining battery capacity;
Very comfortable to ware the size can be adjusted according to the circumstance of individual wrist