This is the Traxxas TQi Stability Management Receiver.
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
Traxxas TQi Stability Management Receiver
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