This is the Traxxas TQi 2.4GHz 4-Channel Radio System w/Link Wireless, TSM & Micro Receiver.

Traxxas models deserve the world's most advanced Ready-To-Race® radio system. The radio system is the sole connection between the driver and machine. It has to be precise, comfortable, powerful, and reliable. The Traxxas® TQi™ radio system features a full compliment of tuning features; long-range, 4-channel versatility, high-output, 2.4 GHz signal, access to real-time telemetry feedback, and proven Traxxas reliability for rock-solid performance. However, the most important and innovative feature may already be in your pocket. TQi is equipped with a revolutionary Traxxas Link Wireless Module that turns 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. The Traxxas Link Wireless Module is compatible with Android or Apple iOS platforms

Traxxas Stability Management (TSM) allows you to experience all the extreme power, speed, and acceleration that was engineered into your Traxxas model making it much easier to control on common slippery surfaces such as dusty asphalt, smooth concrete, and even ice and snow. Punch it off the line and TSM goes to work sensing the vehicle’s direction and making steering corrections to provide straight-ahead full-throttle acceleration without fishtailing, spinouts, and loss of control. TSM also works during cornering, first making intuitive corrections to maintain your line, and then allowing you to hammer the throttle earlier in the turn for much faster exit speeds. Braking is dramatically improved as TSM works to keep you arrow straight until you come to a complete stop.

Gone are the clunky controls and blocky monochrome graphics of yesterday's radio systems. 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.

Intuitive Android and Apple iOS Interface
Once you have created the perfect control settings for your model, you can save them as a profile that you can restore later, use on another model, or share with friends. If the track conditions change, simply re-tune your Drive Effects and save them as new profile.

Edit, Save and Share Drive Profiles
Traxxas Link simplifies orginization of you vehicle collection. With Traxxas Link and the TQi radio system, there's never a need to try and remember which model in memory needs to be selected to drive. Simply choose a model and any previously bound transmitter, power them up, and start having fun. Traxxas Link recognizes the model and picks everything up right where you left off. An unlimited number of vehicles can be permanently stored. The factory settings for all Traxxas models are pre programmed so adding a new Traxxas model to your transmitter is a snap. Traxxas models factory equipped with TQi Traxxas Link receivers are detected and configured automatically.

Real Time Telemetry
Traxxas Link collects and records real-time telemetry data as you drive. When you equip your model with optional telemetry sensors, the Traxxas Link dashboard comes to life showing you speed, battery voltage, RPM, and temperature. The application automatically detects and recognizes Traxxas Link sensors for easy set up and configuration. The dashboard is fully customizable with either dial or digital readout gauges. Up to nine gauges can be displayed at once. Set threshold warnings and log maximums, minimums, or averages. Use the recording function to document your dashboard view, with sound, so that you can keep your eyes on your driving and not miss a single apex. If you forget to record, simply touch Instant Replay anytime to capture the previous minute of fun and unexpected triumphs. The recordings can be named and saved to compare, review, and share with friends.

Manage up to 30 Models with Traxxas Link Model Memory
Traxxas Link Model Memory simplifies organizing your collection of vehicles. The TQi radio system automatically keeps track of what vehicles it has bound to and what settings were used for each. Traxxas Link provides a visual interface to see the transmitter's model history, name the models, customize their settings, attach profiles, and lock them into memory. Traxxas Link and TQi store settings for up to 30 models. Simply choose a model and any previously bound transmitter, power them up, and start having fun. Traxxas Link recognizes the model and picks everything up right where you left off. The factory settings for all Traxxas models are pre-programmed so adding a new model to your transmitter is a snap.

Features:
Traxxas Link™ Wireless Module Pairs TQi with Android or Apple iOS Platforms
Sleek 4-Channel Transmitter Design with Internal Antenna
Equipped with Traxxas Link Wireless Module for Traxxas Link App Expandability
5-Channel Receiver with Traxxas Stability Management
Traxxas Link Model Memory for up to 30 Models
Simple 2-Button Programming Interface
Built in Failsafe
Direct Sequence Spread Spectrum Technology (DSSS)
Uses only 4 AA Batteries
Traxxas Link Application Provides Visual Access to:
Real-Time Telemetry
Customizable Dashboards
Steering/throttle expo
Steering/braking dual rate
Servo reversing
Endpoint adjustment
Profile customization and sharing
Manage an unlimited number of models with the Traxxas Link App