ACEVER Sports Shoes LED Shoes Flashing Sneakers Prom Party Valentine's Day Gift (US8/EU39/UK6/CHN40 for Women) Size: US8/EU39/UK6/CHN40 for Women. Each piece of shoe gives multiple changing colors. There is built-in battery inside of the shoe. The LED light can be recharged. By about 2-3 hour's recharging, the shoe light can keep on for about 8-10 hours. Shoes can be cleaned by soft fabric. But cannot be washed. It's safe to play. The light can be charged by mobile powers which you use for charging your mobile phones.