Batteries(3pcs LR41 AG3) need to be replaced when battery run out,this kind of shoes use 3pcs AG3 battery,NOT LI-battery,last not very long time if wear it long time,it is Not quality problems.we give each order extra LED light set,if battery run out,just replace the battery then ok.Replace method photo shows on the page.Upper material: meshSole material: plasticSize suggestions: Size measurement as following. Please measure your heel to toe length and choose size according to the following size measurement.US Size Description4.72" foot, suggest size: 6M US Toddler4.92" foot, suggest size: 6.5M US Toddler5.12" foot, suggest size: 7M US Toddler5.31" foot, suggest size: 8M US Toddler5.51" foot, suggest size: 8.5M US Toddler5.7" foot, suggest size: 9M US Toddler6.1" foot, suggest size: 10M US Toddler6.29" foot, suggest size: 11M US Little Kid6.49" foot, suggest size: 11.5M US Little Kid6.69" foot, suggest size: 12M US Little KidAbout size:Our size is converted to USA standard according to size chart.You can choose according to the following suggestions. If your kids have wide and thick feet, we suggest you choose one size larger for him/her.Note: different measurement methods, allowing 0.5-1cm error, thank you understanding.Please measure the child's feet long, then choose the size.
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