Romother capacity mah80 sim card typeno sim card slot connectivitybluetooth40 fitness wellnessalarm clock sleep tracker activity tracker cpunrf51822 ramother typesmart bracelet featuresinformation touch screen sports exercise record distance tracking pedometers calories burned heart rate monitor camera anti lost message control modelv2 sensorfinger sensor heart rate sensor supported operation systemandroid ios screen typedisplay technologyoled packing listbody ch