Diameter:7cmGender:UnisexAge Range:> 3 years oldColor:Randomly send(you can tell me what color you don't want get.)Material:Plastic��1: change the battery to open under the help of adults2: do not use the battery from the product for a long time3: when using the product， will switch to [ON] key4: after the switch to gyro idle for a few seconds， when the product rotation and certain inertia to put down.����Note:The product is not equipped with battery.Please customers buying their own battery installed.Please use normal cells， good battery easy to burn out the toys��