Zcoins Boy Girl Roller Shoes with Light Flashing Wheels Skate Sneaker for Kids Teens fabric-and-synthetic Standard Shipping: 15-18 days transit time. There are one wheel version(back) and two wheels version(front and back wheel) optios There is button light switch inside of the shoe, but the inside batteries cannot be replaced or recharged The back wheel can be retractable hided as normal sneaker or pop out by pressing a button at the back of shoe As for Two wheel version,the front wheel can be removed or install easily by a small tool that we send together with your parce