Amazon.com: Walkie Talkie Microphone, 3.5mm PTT Handheld Two Way Radio Speaker Mic for YAESU FT1D, FT1XDR, FT2DR, FT2XDR, FT-50, FT-60, FT-10R, FT-40R, FT-50R, FT-51R, FT-60R, FT-250R, VX-10, VX-14,etc : Electronics
Yaesu FT-51R - YouTube
KA7OEI's blog: A LiIon Pack for the Yaesu FT-530 - and (possibly) other older handie-talkies (HTs).