The TX/RX system is how one "speaks" to the quad and the quad speaks back, if telemetry is used.
FrSky XJT Transmitter
FrSky XJT, an affordable transmitter that will constantly perform and can be used on multiple radios. The SMW3D team has used these on JR and Turnigy radios and love it installed on both. Specs: Super simple...
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