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you know what Society is like these days if I just come out and

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say and that sound bite hits the internet boom cancel and with the number

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of people working here that would be a pretty rough day for a lot of

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hardworking families but guys I got to

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be me and if I can't loudly Proclaim

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that then how could I even drag myself to the office every morning that is

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where this little guy comes in it discreetly prevents your conversations

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from being recorded on someone else's phone hidden microphone or voice

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recorder and as you can tell when I say I don't know

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uh it even works against the professional lavalier microphone that

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I'm wearing it's not perfect though and it comes with some serious downsides so

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before you trust your most intimate secrets to one of these bad boys you

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should probably watch past this super edgy Saveway to our

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mothering sponsor ug green their Nas

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plus its onboard AI assistant makes file management a breeze check it out at the

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link down below the marketing images for the f11 antio recording bug wire tapping

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audio 37 emission hole of ultrasound interference anti EES dropping spy

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device device are a gold mine of dubious

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claims the recording Terminator 37

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launch heads anti-ice recorder recording

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it even claims to have anti- video recording uh here let's try it can can

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you guys see me when I flick the button okay well that last one seems to

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be nonsense but how does it disrupt the

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sound recording the way that it does is it just blasting out white noise so loud

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that you can't hear me no because believe it or not when you guys are

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hearing that mess from the Jammer none of us in

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the studio are picking that up we can all hear each other just fine I can hear

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it okay but you have headphones on let

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me explain many of you will already know how microphones work here's a microphone

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shaped like a cookie good job but for everyone else the tldr is that they

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typically contain a thin membrane called a diaphragm that gets vibrated by

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incoming sound waves that vibration is turned into an electrical signal

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Amplified and the rest of the details don't really matter for now what does

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matter is that a microphone's response to different frequencies of vibration is

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nonlinear meaning that it varies from

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high-pitch noises to low pitch noises

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this weakness is what Jammers like this one can take advantage of by blasting

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out sound waves at frequencies that are higher than the typical human can hear

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they can shake the mic's diaphragm

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around like crazy in the frequencies that we can hear and make it impossible

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for a hidden mic to pick up my secret confessions we're going to link a couple

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of papers in the description if you want to get into the math for how it works

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but for now let's look at this clip that we recorded earlier with a calibrated

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measurement microphone wow just from

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looking at the waveform it's pretty obvious where the

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Jammer turns on and where the Jammer turns off but what's happening at the

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different frequencies this right here is a spectrogram and it visually represents

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the intensity of sound waves in each frequency from 0o Herz at the bottom all

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the way up to 90 plus kilohertz up top

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the brighter the display the more intense the sound waves are at that

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frequency let's blow this up though and take a closer look we mere humans can

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typically only hear sounds in about this range right here from 0 to 20 khz or

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20,000 Herz of course that's when we're young and it tends to narrow as we age

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especially at the high end but as you can see over here that's not really that

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big of a deal given how much of human speech takes place within that range of

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course once the Jammer kicks in you wouldn't have any chance of making out

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any sounds with this level of intensity with all of this noise this still

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doesn't tell us the whole story though and

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hence let's zoom in on just a second or

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two of our jammed section here you can see right here is where our Jammer turns

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on all of the high-intensity sounds are being generated above that range of

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human hearing but by choosing specific

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intervals they're able to induce vibrations that spread to cover the

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entire spectrum and you can see that

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once you've got this much noise it's basically impossible to make out regular

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human speech and it's not just our crappy meat ears that are defeated by

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this check this out I've got a speech to text app on this phone and with the

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Jammer turned off the app does a pretty respectable job of transcribing what I'm

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saying but as soon as we turn the Jammer

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on and the AI would have no idea that I

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just confessed one of my deepest darkest secrets so

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that's it then video over uh everyone go buy one of these uh see you

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later no not quite you see the

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advertising heavily features corporate boardroom type use cases for it so to

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validate that we set up our Jammer in our meeting room and ran a few

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experiments starting with probably the least realistic scenario where our

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recorder here isn't trying to hide what he's doing the Jammer works admirably

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but that's not a huge surprise even

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AliExpress specials like this one rarely

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completely don't work at all what was a

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surprise though was that we almost exploded Elijah's head the first time

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that we turned it on and he didn't have any hearing

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protection it's really aggressive go

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again as it turns out just because most

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mere mortals can't hear what's coming out of the Jammer some can and some

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especially can for this reason while

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devices like this are legal here as far as we can tell we have no data

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whatsoever on the long-term health and safety effects of using a device like

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this and their use could be either dangerous or restricted by your local

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government so your mileage may vary on

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that note let's turn our attention to a more realistic scenario where at least

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one of us call

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at least one of us is trying to hide what we're

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doing our spy now has his device on his lap under the table and since we don't

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trust each other I probably don't want him to know that I have this Jammer so

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I've hidden it next to this potted

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plant what it's a common plant the ca are I just activate all three switches

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so we're blasting out in all directions and then I can say

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regardless of the hiding spot the result ended up being about the same there's

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enough noise bouncing around in the room to mess up the recording however if our

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Target is sensitive to high-pitched noises like the whine of an old tube TV

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they're likely to know that something is a miss and if our spy tries to get even

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a little bit sneakier by tucking their recording device under their clothing

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especially under a couple of layers of clothing well watch this guys I'm about

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to reveal that snake kills

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Dumbledore and there's nothing anyone can do to prevent me from being an any

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questions

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Colin sure the point is it turns out that

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again regardless of the relative positions of our recording device and

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our Jammer a couple layers of cloth are so effective at blocking these super

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high frequency noises that they do a remarkable job of reducing its

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Effectiveness which got us thinking up until this point all the mics we've

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tried have been tiny either literally tiny like these mems or Micro

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electromechanical Systems microphones like you would find in a phone a voice

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recorder or a smart home hub or figuratively tiny like the small

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diaphragm condenser that you would find in the measurement mic or my lavalier

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these two types work a little a little bit differently from each other but what

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they both have in common is tiny thin

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diaphragms that are easily bounced about in the ultrasonic storm that's created

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by the Jammer but of course there's a lot of other types of microphones so we

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rounded up a bunch of examples laid them out and managed the cables with our new

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magnetic Cable Management from LTT Store.com each mic was tested at the

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same distance with the mic pointing straight at the business end of the

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Jammer and we found was that it was quite effective against most of the mems

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mics and small condensers even including

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our shotgun microphone not every mic Was

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Defeated however and our first surprise was the sanken cost 11d which is

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actually the lav mic that I normally wear as it turns out its diaphragm is

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rotated 90° inside its tiny cylindrical

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housing so even head on the sound waves

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from the Hammer weren't actually hitting the diaphragm in a direct path which

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significantly reduces the jamming effect if we check out the spectrogram there's

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none of those zigzaggy lines that we saw before at all another one that was

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interesting was the zoom h1n recorder that uses two small microphones in an XY

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configuration and we found that while both did experience significant jamming

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the one that wasn't pointed directly at the Jammer picked up the voice quite

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well which prompted us then to test all of our mics either 45 or 90° off of the

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source of the interference in addition to our head-on tests so our final

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standout then after those tests ended up being come on the mk416 shotgun from

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Sennheiser not only did it handle the 45

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and 90° tests like a champ but with the Jammer half a meter away blasting down

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the barrel it was jammed and then as soon as we pulled back to a meter it was

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like the Jammer wasn't even there looking at the spectrogram we can see it

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is picking up what the Jammer is throwing down but it's not having a

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significant effect on the diaphragm at other frequencies we think there's a

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combination of factors that are likely contributing to this while the shotgun

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still has a relatively light diaphragm if I were to compare it to a dynamic

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stage mic for example it's still larger and heavier than the other small

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condensers that we tried making it a little harder for the Jammer to abuse

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especially as the mic gets farther from the source also the element is tucked

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away deep inside the mic behind this

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section called the interference tube which basically makes the mic more

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directional especially as the frequency gets higher the result is that less of

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those super high frequency waves from the Jammer are going to bounce all the

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way down the tube and mix together to mess with our recording but as good as

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it is it was no match for larger diaphragm condenser ERS or dynamic

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microphones like the venerable sh sm58

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or our broadcast quality r20s from the L

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show so in conclusion yeah it works but

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it's not the Silver Bullet that the advertising would have you believe

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pretty typical AliExpress against a casual attempt to record a conversation

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it's surprisingly effective but it should be noted that it makes a pretty

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unsettling noise that kind of feels like pressure on more sensitive ears and also

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realistically a narell could easily hide a heavy diaphragm mic up in the ceiling

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over the conference table and catch me off guard that way then again if they've

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got that kind of access to the building they could probably just take me out directly instead of waiting for the

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Pitchfork wielding mob so I guess I'll

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just have to keep my controversial opinions about whether Quebec should

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just leave the country already oh damn it was off to myself for

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a little while longer but I'll happily tell you about our sponsor updf updf is

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custom AliExpress headphones for dank pods that was pretty fun he