This unit can be used with only this type of YAESU radios with 8 pin microphone connector:
FT-736, FT-847, FT-920, FT-950, FT-1000MP, FT-1000MP MARK V, FT-1000MP MARK V Field, FT-2000, FT-9000, FTDX-1200, FTDX-3000, FTDX-5000, FTDX-101.
If at you other radio YAESU, please, contact with me before purchase.
Easy to use!!! Just connect this Sound Processor to the 8 pin mic connector on your radio and then connect the standard YAESU microphone to this unit and it is ready to work. Then turning the pots on its panel just get an excellent quality of your signal. To use the compressor pot in DX pile ups.
WATCH OUT OF FORGERY!!!!