To add to Rafael's post,
There are two types of Microbeast.
One is the stand-alone unit that can be used with most (if not all)
radio systems including Futaba.

The other type is the AR7200BX, BX standing for, of course, BeastX (Microbeast).
It has the FBL Beastx controller built into a Spektrum receiver, and requires
a Spektrum, or JR/Spektrum, transmitter, or another brand with a Spek. module.