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