Absolutely safe and reliable, low voltage to the Children; health is not affected. Waterproof. It's a beautiful shoes, your child will like it Item specifics Department Name: Children Item Type: casual led light shoes Feature: Lighted Outsole Material: Rubber Insole Material: Rubber Upper Material: PU Lining Material: Cotton Fabric Applicable gender: Neutral / boy and girs can be Popular elements: Leather stitching Suitable season: Winter, spring, summer, autumn Please choose size according to size chart carefully. Thanks for your cooperation. Insole length=foot length+(0.5-1)cm Please choose size carefully,fat feet can choose larger size. EUR Size 25=US Size 9 =insole 15.9cm EUR Size 26=US Size 9.5=insole16.5cm EUR Size 27=US Size 10.5=insole 17.3cm EUR Size 28=US Size 11 =insole 17.8cm EUR Size 29=US Size 11.5=insole 18.5cm EUR Size 30=US Size 12.5=insole 19.3cm EUR Size 31=US Size 13.5=insole 19.8cm EUR Size 32=US Size 1 =insole 20.5cm EUR Size 33=US Size 2 =insole 21.2cm EUR Size 34=US Size 3 =insole 21.8cm EUR Size 35=US Size 3.5 =insole 22.5cm EUR Size 36=US Size 4.5=insole 23.2cm EUR Size 37=US Size 5 =insole 23.8cm Note 1、Push the switch,turn on the lights. Color of the lights can change。Long press the switch,turn off the lights 2、If the lights does not work,try charging. 1） when charging, slowly pull the plug slowly. 2）switch hidden inside shoes,it nearby the USB port,you can press it to fix the shoe on one color,or flashing. 3）When charging, the light will automatically turn off the soles until charging is complete. 4）. a full charge 3 hours to maintain LED lights illuminate 9-10 hours 3、Can not be washed. Style 1 :Normal light with 7 colors LED lamps which can be manually switched one by one; Style 2 :White flashing LED light; Style 3 :Automatically switched light with different colors LED lamps; Style 4 :Cyclically rotated flashing light with different colors LED lamps which can be manually switched one by one;