This is the inductive charging coil. It is some one about the main part about the Smart Watch. This is used to charge the battery. The coil is attached to the contact surface on the back of the watch. When this surface comes in contact with the charging plate on the watch stand, the Smart Watch battery is charged through induction. We cannot worried when the batery Smart Watch low empty because the inductive charging coil will charging the batery. We can use the Smart Watch until the end. This main part its connection with batery. Whitout inductive charging coil, the batery cannot charging.