This is the Traxxas TQi Stability Management Receiver.                                                                                               FEATURES: Compatible with Traxxas TQi transmitters equipped with a Multi-                         Function knob                                                                         Turned on or off and adjusted via the Multi-Function Knob, or by                        adjusting the slider in the Traxxas link app                                          Provides greater control on loose dirt, concrete, ice and snow                          Stabilizes vehicles over rough surfaces as the gyro effect of the                       spinning front tires continue to "steer" when vehicle is in the                       air                                                                                   Allows faster cornering speeds                                                          Does not restrict throttle                                                              Improves braking performance and prevents spinouts                                             Fully conpatible with Traxxas Link                                                      Works invisibly in the background to allow driver to maintain                           connected feel with the vehicle                                                                                                                     INCLUDES: Traxxas TQi Stability Management Receiver                                                                                                             REQUIRES: Traxxas TQi transmitters with Multi-Function knob                                       Connecting to Traxxas Link App (iOS or Android version) required to                     update receiver firmware with TSM profile for specific model                          Traxxas Link Wireless Module may also be required depending on TQi                      radio to connect to a smartphone via bluetooth