éHidden switch by the charging port.Shoes contain a cable, but no chargers, please use your phone charger to charge the shoes, Press it to switch on.When charging, the light will automatically turn off until charging is completed,It starts with steady red light.With each press,it changes to another light mode. NOTE: Please do not use it as running shoes and all other strong sports. It's only suitable for casual walking and everyday use. Do not put the sneakers into water, you can use soft cloth to clean them,Or else it will make damage to the light system. And the shoes won't light up again. Switch hidden inside shoes, it nearby the USB port, you can press it to fix the shoe on one color, or flashing,Below it will help us choose right size for shoes, compare the chart size with your feet length carefully before ordering.Thank you! Size Chart(cm): 8.5 M US Little Kid=EU25=Foot Length 145mm 9 M US Little Kid=EU26=Foot Length 150mm 10 M US Little Kid=EU27=Foot Length 160mm 11 M US Little Kid=EU28=Foot Length 170mm 12 B(M)US Little kid=EU29=Foot Length 180mm 12.5 B(M)US Little kid=EU30=Foot Length 185mm 13 M US Big kid=EU31=Foot Length 190mm 1 M US Big kid=EU32=Foot Length 200mm 1.5 M US Big kid=EU33=Foot Length 205mm 2.5 M US Big kid=EU34=Foot Length 215mm 3 M US Big Kid=EU35=Foot Length 220mm 4M US Big Kid=EU35=Foot Length 230mm 4.5 M US Big Kid=EU35=Foot Length 235mm BADIER specializes in the production of quality shoes, trustworthy. You can expect superior quality with a reasonable price and excellent after-sales service.Please rest assured to order BADIER items. BADIER Support Free Exchange and Refund.é