1、2‑in‑1 DESIGN: Four‑wheel skates can freely switch between single and double rows to suit more advanced skaters. When your child rolls in the dark, the wheels will be as bright as lightning. The in‑wheel colored lights generate electricity by themselves and do not require batteries. These skates have better balance and are ideal for beginners. 2、SIZE ADJUSTABLE: The inline skates are easily adjustable with a simple push of a button. Each rollerskate has 4 size adjustment ranges and is recommended for children and adults aged 3 and above. 3、SAFE AND REALIABLE: The rear brakes in both configurations can decelerate or stop easily and safely. The rubber wheels are designed to ensure high-speed performance, but they can skate safely every time. Adjustable straps and adhesive stickers can be easily fixed. 4、WITH SUPERIOR COMFORT: Boasting soft, comfortable padding to keep your child's feet cozy and secure as well as an impressively durable, molded polymer frame for added stability, these inline roller skates promise superior comfort even after prolonged use. 5、ENJOY SPORT FUN: Adjustable 2 in 1 flashing skates allow children to enjoy sports fun and help children exercise bones, joints and muscles. Children who exercise regularly sleep well and have strong immunity. These skates are the best Christmas gift for kids. Specification: Material: Bracket: Aluminum alloy Wheel: PU Upper: Breathable mesh shoes Inner length of shoes (approximately): (S 31-34) (M 35-38) (L 39-42) Precautions for use: 1. To adjust the size, press the button on the side of the skateboard and pull the front of the shoe as needed. 2. In order to maximize the life of your skates, rotate the wheel every 4 weeks. 3. Children need to ride bicycles under the supervision of adults. For the safety of children, they should wear sliding protection devices. 1 Pair x Roller skates 1 x Single Row Double Row Conversion Tool