FrSky Tandem X18RS TD (Mode 2) Radio ControllerFrSky TANDEM X18RS Radio Transmitter TD ISRM RS Edition The FrSky TANDEM X18RS isn't just a radioit's a full blown RF control command center dressed like a transmitter. Designed for serious FPV pilots and RC aficionados who need precision, reliability, and a side of swagger, this version comes equipped with the TD ISRM RS RF modulea dual band (900MHz + 2. 4GHz) powerhouse that laughs in the face of signal dropouts. Whether you're flying long range