Ed, thanks for the comments, but you’re wrong on both points. If you follow the link, I explain why I chose the earbud/mic for my final build, but the wiring diagram and assembly applies equally whether you use a speaker mic or earbud mic for the project. Moreover, the speaker mic in your photo is significantly smaller and, at about 80 grams, lighter than the Elecraft mic and would be a good choice if you are willing to use the rig speaker or plug earbuds into the jack on the bottom of the speaker mic. The Elecraft mic, though much larger, doesn’t have a speaker, so for those seeking a lightweight alternative, the speaker mic could be attractive even if the speaker component isn’t used. As I state in the article, the headphone output on the KX doesn’t quite have enough output for me through the speaker mic, but your mileage may vary. Again, the plan is for adaptation of a speaker mic or anything that has two pins.