Just found this thread and glad I did. I photograph fire scenes and have been looking for a good speaker mic. Like others have stated I have used those off scanner master and they just weren't loud enough , I even tried to rebuild a Motorola public safety mic with a 3.5 mm plug to no success and had resorted to the ear buds. I have seen a video of a similar type mic on you tube and I'm guessing I will be deciding between the two. Here is a Link to the other one. on YouTube .