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Here's my 100% stealth, spy microphone for audio recorders that you "hide" OUTside your jacket, bag, or backpack, left in plain view. Unlike mics you wear under clothing this is less prone to chaffing noise and there is no muffling of the high frequencies because it is not obstructed by clothes. This cord fastener is common on many jackets, drawstrings, and other apparel so it blends in naturally.
I've adapted the plug to work for both mono and stereo jacks, so it won't record to only one side channel (as some mono mics do, on stereo recorders), but for true stereo you need two mics, of course. Luckily, seeing two of these cord fasteners on a coat or jacket looks quite natural; so that's not a problem!
The laws governing recording conversations, lectures, concerts, etc. vary greatly by region. Check with your local authorities and always respect other people's privacy.
Two excellent movies which inspired me to design secret/stealth microphones were: "Diva" and "The Conversation". Check them out!