Yaesu MLS-200-M10 External Speakers are specialized to work with Yaesu FTM-10R, FTM-100DR and FTM-400DR transceivers only. These moisture and dust resistant, 4 ohm speakers handle high level audio, at a maximum of 12 watts, for use in high noise locations. Supplied with a mounting bracket and hardware, MLS-200-M10 Speakers have an unusual three-conductor miniature plug also known as TRS, or tip, ring and sleeve. These speakers are tip positive and ring negative, so they cannot be plugged directly into other transceivers. Connect them only to Yaesu FTM-10R, FTM-100DR and FTM-400DR transceivers.