REQUIRES: AA Batteries: Four for transmitter Servos and receiver of modeler's choice COMMENTS: *Traxxas Link Wireless Module is not included and must Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles Your mobile device combines with the Traxxas Link App to deliver an intuitive, high-definition, full-color graphical user interface Use original Traxxas parts to get the most out of you Traxxas RTR vehicles