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