Please choose the correct size according to the size chart we provide (second picture). [USB RECHARGEABLE] The roller shoes could be charged by USB. There is a charging port and LED light switch in the shoes near the shoe's Tongue, please see the picture. It often costs 1-2 hours to charge full and can bright for about 5-8 hours [COOL & EASY TO LEARN] The LED light up shoes have 7 colors and 16 lights modes,you can press the switch to control the modes. Kids take a short time to learn to roll the double wheels roller skate shoes ,it is easy to them.The best birthday gifts for kids [MORE FUNCTIONS] You can remove the front wheels by our tool,and hide rollers by pressing button at heels, then it change into a pair of normal sport shoes. When you want to glide, press the button at heels, the rollers will pop up.Press and the front wheels are stable [AMAZING GIFTS] The shiny and funny wheels shoes bring kids happy mood,they love them as the birthday gifts ,Christmas gifts .Boys and girls take them in the Party ,special festival,at home and in the park,these LED shoes are very popular