I am almost certain that the mic array is actually the same as that on the Instamic.  The front facing mic aperture is quite wide, allowing space for more than one of those little MEMS devices.  The supplied windshield covers those mics and not the side ones, probably because if the side mics supply the stereo content, those using the mic just for transmitting audio to the receiver do not need to use those side mics.  They only come into place for recording 32 bit float stereo.  But the front mic, or mics, is used for creating various polar patterns, which I believe is what you can do with (say) 4 MEMS capsules.  So it really is a direct competitor with the Instamic.

I bet Insta360 would have called it the Instamic if Zoom/Instamic hadn't already bagged that name...

pin: https://www.digikey.com/en/products/detail/molex/0008500113/304071

If you look at my post above there are other part numbers there as well.

It always seems like Jon is taking a break. You should email him at least and let him tell you himself.

Yes. I guess I should email Jon. I don't know why I didn't just start that way...

On a brighter note:

https://www.molex.com/en-us/products/part-detail/08650804

https://www.molex.com/en-us/products/part-detail/08500113?display=pdf

This seems to be the one!

While doing a test recording, I accidentally dropped an aluminium ladder flat onto a concrete floor in the garage, quite close to the device.  I nearly jumped to the garage ceiling.  Obviously the waveform at that point was seriously clipped-looking, but lowering the level by 15dB in Audition reduced it to a nice rounded transient peak.  It looks like it should handle most real-world levels.

Some more experiences today -

- Being able to pop a one-piece field recording system routinely into a pocket, ready for the unexpected, without the slightest problem is a game changer for me (much as I hate that phrase)

- I recorded a couple of minutes' suburban traffic noise - passing cars - stereo image is fine.  120 degrees maybe?

- I popped it on my diesel car's front passenger seat when I was on a 10 minute drive.  The result - lots of low frequency stuff, but the car radio music (1930's stuff) was perfectly clear and well placed in the stereo image.  Generally, my feeling is that this device is more bass heavy than top heavy, but given that it's easy to EQ high frequencies higher, I'm not that concerned.  When I can hear it with my best headphones and compare with other devices, I'll be more certain.

- I finally managed to slide off the mounting clip from under the recorder and then tried the magnetic clip.  Attaching that to the fridge lead to some difficulty getting it off again... given the tiny weight of the device, mounting it on a suitable metal surface should not lead to any concern about it dropping off.

- An elderly friend was convinced he could hear a wasp in his lounge, flying around.  I suspected it was imaginary, so I whipped the Mic Pro out of my pocket and recorded a minute of room silence.  Then in the phone, normalised it.  No wasp, but I could hear a clock ticking that I was unaware was in the house - quite likely from a different room.  As discussed in another thread, separating environmental noise from system noise in normalised 'silence' can be tricky, but I'm confident that the chances of noise being an issue with this device is minimal.

- I wish the two LED indicators could be turned off.  They could be covered with tiny bits of insulation tape but that would be a delicate operation!  The device does vibrate to indicate functionality, however.

- I will try to remember to leave it recording overnight to check battery life.

- According to AI search, this device uses MEMS mics and associated techniques to obtain stereo recording from closely spaced omni mics.  I can't find where AI might be getting that info from, but the features of the mic do strongly suggest that it is indeed a MEMS device.

- If the device is set to record 32 bit float stereo internally, then you can't record it with any of the built in 'effects'.  It's just the pure stereo thing, which is fine.  If you set it to mono, and ask it to record that with processing, then you can set the mic array to record internally as if it was omni, cardioid, fig of 8, or narrow.  I've tried cardioid so far, and it certainly rejects the sides and back.  Now whether these settings would allow a pair of these to be used as a pair of cardioids or omnis instead of just one for single point stereo I'm not sure, in terms of how good the result would be.  But it's possible on the face of it.  Maybe one could even create an MS pair with one set to cardioid and the other to fig of 8.

OK, enough for one day...

My Mic Pro has arrived, and all I can say is - wow.  BUT - I'm actually not at home for a few days, and so I am only able to test it with items that are to hand - not my best headphones, and no access to analysis tools on my PC (although it may be possible to do that remotely...).  Still, I know the sound of those headphones well, and the playback really was impressive.

Note that I bought only the mic, not the wireless receiver.

First, it is somehow smaller than I expected.  Given that its buttons, mics, and LEDs are around the edge, there is only just enough room for them. It comes with a soft carrying bag with space for accessories. As an extra, I bought the full size wind muff which wraps round all three mics. 

Setting it up was very straightforward using the app, which includes a remote record button and a slew of optional settings (which I have yet to explore).  So within a few minutes I was testing it out by speaking a nursery rhyme into it (as one does).

But then came the challenge of how to hear the result.  I don't have a PC here to connect it to.  It has no playback ability at all.  The only way to hear the recording is to access the file via the USB-C port, which they also manage to cram into the periphery.  Luckily I had brought from home one of those thingys which plugs into my phone and which has a number of USB sockets on it, and connecting that to my phone and to the Mic Pro enabled easy access to the file on the device, which I then copied onto the phone.  The phone saw the Mic Pro like an SSD or the like.  Then I unplugged everything, plugged my headphones into the phone via a USB adapter, and replayed the file.  The phone seemed perfectly happy playing a 32 bit float stereo file.

Frankly I wasn't too impressed.  The stereo image was slightly odd and the sound of my voice was indifferent - but then again, most of us don't like the sound of our own voice!  However what probably didn't help was that I had the mic in my hand, which could well have been occluding the mics a bit.
 
So then I tried recording the replay of a short track featuring a young lady singing with a jazz band. And this time I put the mic on the table in front of the speakers (again, not the world's best speakers, just small bookshelf ones).  When I replayed that, my jaw dropped, as the frequency response was great at the top and bottom ends, and the stereo image was spot on. It simply sounded like what I'd just been listening to.  At the end of the track I detected no audible noise, and I'd had the music playing pretty loud.

At the point I had to attend to domestic matters, but of course I will be doing further tests as the evening progresses, and reporting back here.  But my initial feeling is that this is a device to be taken seriously.  OK, the lack of monitoring and easy playback might rule it out for some, but the plus points, coupled with the USA price of just $99, seems to me to make it worth considering by anyone wanting to record 32 bit float stereo with a device that is barely there at all.  And all you do is press one button.  OK, two if you count the power button as well. 

And despite hours of reading reviews and watching the slew of them on YouTube, I seem to be the first person to spot its potential as a tool for field / location recording etc.  I think Insta360 may not realise what they have created.

I will also be considering mounting options. Just holding it in your hand can be problematic as it's hard not to end up with your fingers on,  or too close to, the mics.  But it can be clipped to something like a bent piece of cardboard held in the hand with the mics unobstructed.  Or clipped to a baseball cap so long as you don't move your head.  Many possiblities.

Oooo, I'm going to have fun with this...