You need a microphone broom (sweeper).
Shoephones!
But seriously, you could just about hide an inexpensive but good quality wired recording devise anywhere these days, even in a cuff of your coat or in a tie.
Microphone detectors to my knowledge work on RF detection for wireless. I’m not sure what can be done about wired.
Try white a noise generator.
Most phones can record audio. Microphone detectors really detect the rf of a transmitter, not the microphone itself. But these days you would have to detect such a wide frequency range (525 khz to 2.4 Ghz or more) at such a low power that it is an impossible task for an amateur.
Even a pair of bluetooth earbuds can pair with a phone and record audio.
I could tell you that, but then I'd have to kill you.
Regards,
A MEMS microphone is about the size of a grain of rice, so it can be placed virtually anywhere (consider the hearing aids that fit entirely inside the ear). If you are unaware of where a surveillance device may be present, it’s impossible to “block” it from communicating or storing information that it picks up. You can only obscure the information you want to be private by making it difficult to pick up (i.e. by whispering) or by obscuring it in interference such as white noise or other sounds that will appear as loud or louder to the microphone and thus make it more difficult or impossible to understand what is said. Of course the time-honored spy movie notion of turning on a radio or TV is an example of this but modern DSP methods are vastly more effective at separating information from noise than most people would expect (consider the devices that extract vocals from song recordings leaving only the music track for karaoke purposes). There are surveillance methods that detect the vibration of glass windows caused by voices insidea a room, and spread spectrum radio transmitters that are virtually undetectable.
No means of protection is foolproof and 100% effective, you can only do things that make it more difficult for someone to listen in.
Just Google pen camera with audio and take your pick.
Bkmrk.
I saw a Rockford episode where Rockford discovers a ex FBI agent has wiretapped several people including his father using physical microphones planted at the location.
He just dialed a number for the bug and listened in.
That show was 40+ years ago.
Today the wiretap is not in your home but in some telephone exchange. You would have no idea you were being bugged.
Only way to block is use tin foil over your telephones and now the smart tv and laptops with cameras built in. Then there is the tracking of where you have been on the internet and the searches you do like voice jammers to block recording of conversations? What about microphone detectors etc.
That caused a red light to start blinking and the FBI and NSA are now listening in and watching what you are typing.
So good luck and look out for black helicopters and black SUVs following you and a van down the street parked in the same spot for days : )