@arth sound quality is one reason to use a different mic, size is another. When out an about in the big blue shack, I prefere to use headphones. So I do not have a need for the stock speaker mic of my #lab500 #tx500. Instead I use the one from Tüfteln: https://tufteln.com/products/lab599-tx500-audio-breakout-board-with-microphone. Less weight and less bulk. Especially important when rucksack portable.