Yaesu Vertex SSM-10A Speaker Microphone.
WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. www.P65Warnings.ca.gov
It was left out of the description, but this Microphone fits the 450 also.
YAESU VERTEX SPEAKER MICROPHONE FOR FTA 550 750 850
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Yes, this is compatible with the FTA-850L.