This is actually a very, very good mini mic for the iPod 4/4S and the 5/5S. I use it for dictation on Notes and Speak&Translate. It's sensitive enough to catch a conversation at normal person-to-person distance, even on the street with all that traffic noise. High fidelity capture. On the 3GS, as per instructions, you need to download certain apps. However, I suspect that if you update the iOS it will work on native apps. I don't want to do that, though, cause the iOS might render my older apps unusable. So, bottom line is, I liked this so much I immediately ordered 10 more.