Traxxas TX TQi Link Enabled 2.4 GHz Hi Output 4-Channel Vehicle Full complement of tuning features, long-range, high-output, 2.4GHz signal, and proven Traxxas reliability for rock-solid performance Can be equipped with an optional #6511 Traxxas Link Wireless Module to connect wirelessly to your mobile device Your mobile device combines with the Traxxas Link App to deliver an intuitive, high-definition, full-color graphical user interface Requires 4 high-quality AA alkaline batteries Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles