I have a vintage MFJ 432 voice keyer that is surplus to my needs,

it is for sale or I will trade for equal value CW Key

it is ideal for calling CQ on CW or for use in a beacon or for calling on AM/SSB

This unit is wired for my Yeasu FT-991 /FT-818 microphone plus the round 8 pin plug on the front

I made 2 videos on how it operates https://www.youtube.com/watch?v=CeV08g6Kkkk&t=2s

and more details at http://www.radiomanual.info/schemi/ACC_audio/MFJ-432_user.pdf