<ul><li>This slot car set is able to connect with smart devices and uses an app to enhance the racing experiences. The app shows your real-time racing data. While you are racing, it also has voice commentary and racing sound effects. You can share your contest results to social networks. * The app is free in apple store and android market. </li><li>The track is 8 Meters / 26.2ft long. </li><li>Cars: Mercedes Benz SLS AMG models in 1:43 scale. </li><li>Set includes: ASR control box with built-in bluetooth, track pieces, controller*2, cars*2, transformer, and other accessories.</li></ul>