1.Precise core  movement  ,silicone band and core moment

 2.Ergonomic design and easy to wear                                                              

3. Slap the strap on wrist, it can roll along your wrirst naturally (no buckle needed )Steel bar inside, Silicone outside for protection                                                                                                 4.Water Resistance, free to take swimming,                                                                         

5.Changeable battery, long time use watch