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Radio Controllers typically arrive in 2.4GHz or a crystal based radio transmitter. 2.4GHz transmitters do n't want different crystals for racing against a number of people. Usually a hundred radio controlled models can run with a 2.4GHz transmitter as every RC model is 'binded' to it's transmitter and won't interfere with other sites.
Next include the buggies. Really are these things anyway? Of those ingredients little RC vehicles which could run up to 60mph.