MukikiM Free Riderz Volt - A Modern Take On A Classic Toy! Friction Powered-Rev It Up And Let It Go! Features Unique Lights, Sounds, and Music Too! Friction Powered so it's easy for kids to use, and there's never any batteries to replace Colorful LED lit tires are sure to amuse boys and girls with hours of play Push down the back end and you'll hear the "motor" revving up Unique music will play too, kids love it! With 4 cool styles to choose from, there's one to fit everyone's favorite bike type!