Wonder World Delight Fitness Smart Band(Black Strap, Size :)

1. Water resistant (IP67)2. 30-day standby power3. Sleep-cycle smart alarm4. Fitness monitor & sleep tracker5. Running MIUI Android 4.4 and above Battery Capacity : 41mAhCell Type : Lithium Polymer.Input Current : 25mAh (TYP)Compatible with Xiaomi Mi4 / Mi3 featuring Bluetooth 4.0