About size Below is our size comparison table: EU27 —— Foot Length(in) 6.98" —— 11 Little Kid EU28 —— Foot Length(in) 7.18" —— 11.5 Little Kid EU29 —— Foot Length(in) 7.38" —— 12 Little Kid EU30 —— Foot Length(in) 7.57" —— 12.5 Little Kid EU31 —— Foot Length(in) 7.77" —— 13 Little Kid EU32 —— Foot Length(in) 7.97" —— 1 Little Kid EU33 —— Foot Length(in) 8.16" —— 1.5 Little Kid EU34 —— Foot Length(in) 8.36" —— 3 Little Kid EU35 —— Foot Length(in) 8.56" —— 3.5 Big Kid EU36 —— Foot Length(in) 8.76" —— 4 Big Kid EU37 —— Foot Length(in) 8.95" —— 4.5 Big Kid EU38 —— Foot Length(in) 9.15" —— 5.5 Big Kid EU39 —— Foot Length(in) 9.35" —— 6 Big Kid EU40 —— Foot Length(in) 9.54" —— 6.5 Big Kid Note: Please measure the size of your child's feet before purchasing, refer to the size chart above to purchase. Because the shoes are equipped with wheels, they are heavier than normal shoes. Description: Regarding charging and lighting, we present the charging cable, the charging port and switch are under the Velcro. You can use a mobile phone charger base or a computer USB interface to charge the shoes. Generally, it takes two to three hours to fully charge. The lights of the shoes will flicker when charging, so don't worry. The lamp can be used for three hours after fully charged. Question collection: Q1: After I received the goods, the shoes did not light up, what's the matter? A: Our shoes are fully charged and checked before leaving the warehouse. However, during transportation, the switch may be accidentally touched, causing the shoes to run out of power. Just fully charge it. Q2: I can't find where the charging port is? A: The charging port is under the Velcro, you can see it by opening the Velcro. Q3: I lack accessories after I received the shoes. A: Please send us an email via Amazon, and we will reissue the accessories for you.