Lying on rails placed on the gyro, gyro let slide up and down on the track. Let rolling gyro and up to a certain speed, the gyro will be issued their own colorful glare. If the gyro flash function does not start, you need to increase the wheel rotational speed, the centrifugal force so as to achieve enhanced light start. 90 degrees towards the direction of the horizontal wave wheel, when the gyro has enough speed to ground threw the gyro, the gyro will be high-speed rotation in the ground and have a magical colorful lighting effects. You can catch the ground wheel spinning top , and continue its rapid rotation . Gyro on the rollers have more fun! Specifications: Item Type: Gyro Toy For the crowd: 3 years old or older Material: ABS+Metal (Built-in battery + led lights + the magnet ) Color: Hot Pink,Orange,Blue,Green Size: app.20.5cmx7cm/8.07inx2.76in Quantity: 1 Set (other accessories demo in the picture is not included) Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Gyro Toys