My experience with quite a few RC Toys has showed me that high end quality Rc such as branded RadioShack, Tyco, and Nikko use their very own TX and no matter the 27 or 49mhz range and even more each car from those brands use in general its very own TX! Another experience today done on a tyco Rc truck running also on 49.860 MHZ only another Tyco TX could have it running when any other TX failed and over the two Tyco TX one them could only make the truck run for one feet distance when the other Tyco TX worked perfectly with a range of about 100 feet, both testing with the same battery, call it weird!!!