Thanks for the info Tim. The battery and MOSFET threw me. The Palm keys certainly don’t need or contain that circuitry to function, neither do the two Benchers I use at home. I don’t know the intricacies of Vibroplex or Begali paddle keys as I am unfamiliar with those. The four paddle keys I have (two Palm and two Bencher, a chrome and a black, use a simple metal to metal spring contact at the points, no electronics whatsoever.
Looking again it appears your keyer has no moving parts then and relies on contact with the skin on your fingers to produce dots or dashes - like using a touch screen I suppose… I’m old sckool in that case, so I wouldn’t mind trying one. Final comment - if that is the case would your key work if you were wearing gloves?
73 Phil