The FlySky FS-i6 is a 6-channel 2.4GHz surface transmitter system commonly used for RC cars, trucks, and crawlers. In kits like the Tamiya Grand Hauler, it’s often paired with a compatible receiver to handle basic driving plus extra functions like shifting or lights depending on how you wire it. The Grand Hauler itself is a 1/14 scale semi-truck kit that typically needs a separate radio system, servo(s), ESC, and sometimes a multi-function unit if you want lights and sound.
The FS-i6 is popular for these trucks because it’s affordable, reliable, and programmable enough to handle: