The Traxxas Link Wireless Module plugs into the side of your wireless-ready TQi transmitter. The module uses Bluetooth low energy to connect to Android 4.4 and up or Apple iOS 4.3 and later platforms. Pairing your transmitter with your mobile device allows Traxxas Link Wireless Module to turn your Android or Apple iOS device into a powerful tuning tool for your Traxxas model. The full-color display combines with the Traxxas Link App to deliver an intuitive, high-definition, full-color graphical user interface that unlocks the mysteries of optimizing your radio system for ultimate vehicle control. This powerful app gives you complete control over the operation and tuning of your Traxxas radio controlled model with stunning visuals and absolute precision. Install accessory Traxxas Link telemetry sensors on the model, and Traxxas Link displays real-time data such as speed, RPM, temperature, and battery voltage with brilliant graphics. Traxxas builds the world's fastest Ready-To-Race radio-controlled models. That level of performance demands precision control. Traxxas Link app gives you the tools for exacting adjustment and superior control while always keeping you informed on your model's status and speed.