1. 2-IN-1 DESIGN: Four-wheel skates can freely switch between single and double lines to suit more advanced skaters. When your child skates in the dark, the wheels will be as bright as lightning. The colorful lights on the wheels generate electricity on their own and do not require batteries. These skates offer better balance and are ideal for beginners.2. ADJUSTABLE SIZE: The inline skates are easily adjustable with just a simple touch of the button. Each skate has 4 size adjustment ranges and is recommended for children and adults ages 3 and up.3. SAFE AND RELIABLE: Rear brakes on both configurations allow you to slow down or stop easily and safely. The rubber wheels are designed to ensure high-speed performance, but allow you to skate safely every time. Adjustable chains and stickers can be easily attached.4. SUPERIOR COMFORT: Featuring soft, comfortable padding to keep your childs feet cozy and secure, as well as an impressively durable molded polymer frame for added stability, these inline skates promise superior comfort even after prolonged use.5. ENJOY THE FUN OF SPORT: 2-in-1 adjustable roller skates with flashing lights allow children to enjoy the fun of sports and help children exercise bones, joints and muscles. Children who exercise regularly sleep well and have strong immunity. These roller skates are the best Christmas gift for children.