Under the "learn more" tab the following text is available "The concept was initially developed to be used by two Yaesu FT-5000:s, but when it’s now released to the public it will also work with FT-950, FT-2000 and FT-9000 in pairs. Combinations of them can also be used, a FT-5000 can be controlled by a FT-950, FT2000 and FT-9000 also."
/mike