Answer:
The optional voice guide unit for the Yaesu FTM-300DR is the Yaesu FVS-2. This unit provides audible confirmation of frequency, mode, and other settings for the visually impaired or those who prefer to operate their radio without having to look at the display.
The FVS-2 plugs into the back of the FTM-300DR and features adjustable volume and speed controls. It is also compatible with Yaesu's FT-3DR and FT-70DR handheld transceivers.
It is important to note that the FVS-2 is an optional accessory and is not included with the FTM-300DR. It can be purchased separately from authorized Yaesu dealers