Running Two Models at Once
Article #23106
Can I run my Traxxas model at the same time as my friend who also has a Traxxas vehicle? Yes.
If one or both of your models is equipped with the TQ 2.4GHz radio
system, you can just "switch on and drive." The TQ 2.4GHz radio system
automatically locates and locks onto an open frequency. If
you are both using the AM TQ radio system, you will have to make
certain your models are not on the same frequency. There is a crystal in
the transmitter and a matching crystal in the receiver onboard the
vehicle. These crystals control the frequency that your vehicle uses in
its transmitting and receiving of its signals. As long as your two
radio systems are using different frequencies (different color crystal
sets), they will not interfere with one another. Traxxas offers six
different frequency crystal sets for its radio system. If you and your
friend happen to be on the same frequency, you can purchase a
replacement crystal set for your radio system so you can run your
models at the same time. The part number to order would depend on which
frequency crystal set you need. #2031--------#1 brown 26.995 MHz #2032--------#2 red 27.045 MHz #2033--------#3 orange 27.095 MHz #2034--------#4 yellow 27.145 MHz #2035--------#5 green 27.195 MHz #2036--------#6 blue 27.255 MHz Note
that the crystals are labeled TX and RX on their tags, as below.
Install the TX crystal in the transmitter, and the RX crystal in the
receiver. 
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