This is the Traxxas Wireless Remote for the TRX-4/6 Pro Scale Winch and the New Drag Race Start Light.
Convenient 2-Channel Remote
The fob-style remote is easy to keep handy on a keychain or lanyard, and small enough to mount directly on the transmitter. Two channels are selectable, allowing front and rear winches to be installed and controlled independently. Switching channels only takes a moment—just press and hold the remote’s Channel Select button.
or
When using the Drag Race Start Light (6595), add the optional wireless remote to allow a race director or flagger to manually control the start of the race for authentic no-prep racing fun. The remote can also be used to start the automatic light sequence conveniently right from the starting line.