What Are Those Stickers on Items in Shops
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- čas přidán 12. 03. 2017
- What are all those square (or rectangle) stickers on items in supermarkets? Those are part of Electronic Article Surveillance (EAS). The labels are Electro-magnetic (EM), Acousto-magnetic (AM) or Radio frequency (RF) tags used to prevent shoplifting. They are detected by antennas at the exit of the store and trigger alarm. If the item is paid, the tag is deactivated and doesn't trigger alarm. The RF ones are a simple resonant LC circuit which is being deactivated by a strong signal that shorts out the capacitor. I managed to find one RF tag (this is the square one) that wasn't deactivated, so I tried to build my own simple detection circuit and measure its operating frequency. The nominal frequency of the RF labels in retail stores is 8.2 MHz. I have measured 8.65 MHz. This is pretty close given how inaccurate those low cost disposable resonant circuits must be.
The oscillator in my schematic is built with 74HC14 (6x Schmitt inverter). One inverter as RC oscillator, one inverter as a buffer and 4 inverters in parallel as a power output stage.
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In a world full of CGI one can really appreciate your handwritten schematics and animations. It's especially nice in an electronics-related channel like yours where it gives a well balanced result.
Thanks :) I'm a bit old fashioned :)
Not sure if sincere or sarcasm :)
0:52 wtf i am dying
BëęB bêĘB 🅱️æ🅱️
Hahahaha I love your low budget animations !!! LOL !!
true engineer, not animator haha
He explained us as well so its mean that was helpful
Used to have fun at the malls when on leave. Had a access control badge for my assignment. Huge center for military and many doors were set up as man traps, if your card was not authorized to enter that section of the building one out be trapped between two locked doors until security escorted you to interrogation. Well the badge did a damn good job at setting off these alarms in a lot of retail stores. Every time I entered, Alarm. Every time I left, Alarm. Had fun with security, they could never find anything on me that belonged to the store. Used to tell them I was involved with government projects that involved high voltages and that I ad been accidentally shocked on time and ever since I have had weird effects on electronics. They always took a step back and checked their watches and radios.
Nice!
Hm I like you
Those are the easiest to defeat, just cut them in half (scratch) to damage the coil and that's it.
Woot
also the spider tags. you can just stick a sharp object into the tweeter and cut the wire or take a 250lb magnet to it
I've always wondered what these stickers are really for when I was younger, and I really liked to take out the metal inside of them; this video is really informative, thanks for teaching us! :)
Beep, beep. :)
It's the sound of da police. Beep, Beep. It's the sound of da police.....;-(
AHAHAAHHAH I WAS SEARCHING FOR THIS COMMENT
In target there aren’t any sticker tags on the $40 mouses but there’s tags on $5 makeup 😭
Pull them off
People steal makeup like it's not an actual crime
Back when I worked as a cashier I used to prank my coworkers by leaving those security tags sticky side up on the floor so that they would stick to their shoe.
And they say Hitler was bad..
I heard that coworkers that do this kind of pranks tend to get beaten up back in storage if they continue doing this for too long...
evil..very evil
How come the cashier has a pineapple on her head?
I would rather say it's a pineapple with arms.
that's actually another anti theft measure
That is exactly what I was looking for! Thank you
When you started making that beeping sound I laughed so hard 😝
Really interesting and you make it so simple and fun to learn. Thanks so much :-)
Good information, I didn't know the stickers returned a signal. Thanks for the video sir.
a huge fan of your presentation style at 0:40
always thought the barcodes somehow made the sensors beep hahah this maked a lot more sense. thanks a lot for this comprehensive explanation ❤️❤️❤️
oh god!! thank you dude this is exactly what i was looking for !!
Loved the animations
Awesome videos.... and your drawings are great too!!!! Thank you
I never worked out how they deactivate these! In other systems, deactivation is "complex" and visible.... thanks for the explanation.
Your accent is so refreshing, I love it. Great video!
excellent concise presentation.
Great animation😁 i loved it!!
At 1:58 where it shows the graph of the RF pulse, and the resulting return signal, I notice two effects. There's an initial low output from the return signal early in the pulse, but then a lingering ring down after the RF pulse. So there are two potential ways to detect this return signal. The first (as described in the RF tag section of a Wikipedia article about EAS tags) is to detect the initial decrease in pulse signal strength when a tag is present. The other way (as described in this video) is to detect the continued "ringing" of the RF tag after the pulse transmission has stopped. Which detection technique is actually the most commonly used one?
I also remember a few years ago something I read online that says these tags not only contain an inductor and capacitor, but also a diode. The diode chops off half of the sinewave, resulting in multiple harmonics being generated, and that the tag is detected by a receiver that listens at the harmonic frequencies. However I have never seen a diode on one of these tags, so that description I'd read before may be inaccurate.
Thank you so much! I was desperately looking for how RF EAS works for a physics project and can't seem to find any, until I found this!
Our company provide EAS products,if you are interested,can contact me.
This was ab awesome presentation! 🤙
thanks for making this video, it helped a lot !
I enjoyed this video annnnnnnnnnnnd I’d like to watch more of your videos annnnnnnnnnnnnd it was very educational
Very interesting. I always wondered how those work.
I always assumed they had some kind of active device inside. It's amazing how simple they are. They must come in different frequencies though because they will only work in certain stores.
thank you alot
I am provider of this security tag and you make my mind double, even till today they (makers) can't make me understand how its work. thank you i am smiling on those Chinese maker
I am also provider of this security tag
very informative! also hilarious!
The deactivations have never worked in the history of mankind
They do work, but as he has pointed it out the resonant frequency of these things changes a lot. Any deformation of the item (creasing, bending, pushing etc.) causes a change in the resonant frequency, which is probably one of the reasons they only tend to use these items on stock that has solid, hard packaging (like books, CD's/DVD's, small electronics etc.). Every now and then they might put it on some unsuitable items however and then the de-activator fails to de-activate it, because the item's resonant frequency will be outside the frequency range used by the de-activator.
wow. super video...
kryštof Macek heeej ty take pozeras yunez
clicked thumb s up, solely for the awesome "special animation effects" lol!!!
funny shit is i got caught shop lifting and they made me do this program which tells you what each alarm and securtiy stickers do and im like wait if i learn off of this that means i can easily find a way to slip it off and guess what? that cashier thought she was finna catch me stealing chargers and i waled off with 60$ worth of chargers and earbuds and i peeled every single sticker off
I'm also wondering, do the actual antenna units in stores have 2 coils in them, one for transmit, and one for receive? Or do they use a single coil for both transmit and receive, and then have a complicated circuit to differentiate between the transmitted and received signals?
Mind=Blown!
I'm curious if standing over that all day has health effects to the cashier
I think that the pulse is activated only when an item is detected and even then it's only for a split second. RF stuff is pretty tightly regulated, particularly the transmitters.
Very interessting
Multiple times i triggered the alarm in the shops with only RJ45 cable. If you make some perfect tight roung coil, then you can trigger the alarm.
I dont understand i checked out a perfume like standard procedure of buying but with that bag every shop i entered was beeping i felt so embarrassed... why does that happen if it passed through cashier and all?
OMG my youtube has deleted all my subscribed channels and completely stopped feeding me your videos. Haven't watched one in over 6 months I think.... gotta catch up now! Resubcribed!
Very good
thanks for the explanation.
I wondered if that is an RFID tag and could be used for something. but if it is just a capacitor with an antenna, and the capacitor is shorted, then it is useless.
*Can you give us the oscillator circuit ?*
Thank you
Beeeeep lol
*BEEP BEEP BEEP*
*I have a question! Can you change the frequency of RF tag? Meaning not changing out the capacitor nor the coil for diffrent ones, because frequency is affected by period and in LC circuit period is T=2π √LC*
Yes, you can.
Do you have a schematic somewhere on this oscillator?
hello, very nice video, what is your oscillator ic?
what about the paper thin silver-colored contacts in the white plastic sticker on the inside of the clear package? they are magnetic.
Can we prevent it like using aluminum foil as a faraday cage?
can you explain any differences between the RF theory and application of EAS versus timed single- and double-use public transit tickets? I split the faces of a ticket to reveal a circuit very similar to the above - a coil with centre capacitor and a black dot on a different part of the circuit - with some minor differences. I struggle to understand how the receiving system can know the difference between a single- or double-use ticket, and how a life span of 3 months can be programmed into the ticket (i.e. when you a buy a ticket, you have to use it within 3 months or else it will expire). Do you think the single- and double-use tickets possess the same circuit within and are programmed in some different way, or do you think they are two different circuits, dispensed from the ticket machine from two separate rolls of not-yet-activated tickets upon purchase?
Hi. What you are talking about I believe is RFID.
RFID tags transmit data through its coil whereas RF Tags do not transmit any data
Each RFID tag would have its own unique number which would be put into some sort
of database, when you presented your card the system would check if it is on the
database and if it is then it would do what it has to..
Hope I was of help
@@Dan-yu6hv thank you, that has set me in a direction to investigate.
Hi,
Could you tell me how they are manufactured like what machine or material is used.
Thank you
I just peeled one off of a quart of oil, and just got curious how the deactivation worked
So that basically explains that reusable RFID tags use solid coils and a solid state capacitor and the pins is the link to reactivate the sensor for multiple uses. Right? So basically, just cut the coil and terminate the circuit.
Here in finland we dont have those stickers but in electronics and clothes there are some kinda detectors.
@eebenz Ok weird. I've never seen them. U sure it was in finland?
@eebenz Oh ok
So is it basically easier to shoplift? I've seen some bars outside the shops your have to pass through I thought that's what they check for
lol, im here after gettin caught in shoplifting. now i know how to cheat the system. thnx for the video
Good day sir. Do u have an idea how would i disable the sticker instead of using deactivator? In that way, the sticker can re use or Enable again.
where did i found this kind of electronic surveillance (for the use of shop)
Do you know where to buy such (Wirkung) Tags?
Nice project! Would you share the circuit diagram of the 74hc14 osc?
3:11 minutes
if it is problem goes on and off ?
because i dont understand ?
I remember playing with these when i was a kid& I thought it was a secret item/content with my game
How can i get one without deactivating ?
I’ve bought a money pocket bag from other country and arriving to my country I found that still magnet inside my bag ( I can found where is inside bag ) but as I pass the any shop gate I have problem , how I can reactive it ?
Hmm 🤔 I wonder if I can use a hackRF1 to broadcast an inverse 6.2MHz frequency that cancels out a stores’ detection system? Causing every single detector to go off at the same time.
If you try please make a video
Great vedio
what is perpose? pls explain
That would mean, during a price check, the capacitor would be destroyed and people can steal.....
Now i know when i shop at TESCO i see the electromagnetic one
Merci!
Hey, can you send me the circuit for the resonance frequency detector, I want to find the resonance frequency for a Tesla coil
Btw. I like your videos
Are ubfrom Croatia becaus of batery from Kaufland
What happens if you break the circuit (ie run blade across the capacitor a couple of times) *asking for a friend
how get tag and soft tage...e sequrity
nice
Hi sir would you tell if i can use this sticker as camera or there are optical sticker which can work as camera my idea to count passes cars foom beside me an show name
No, you can't use this for anything like that.
That chicken joke is impressive.
So to deactivate them all you need to do is break the circuit like poking a hole through the capacitor in the center of the square?
Thank you. I found one loose in the packet of a Powerbank. First I thought it had something to do with optional wireless charging! 🤣😂😜
Thanks to your video I now fully understand! 👍👍👍
(There was indeed also one under the price label!)
Does tin foil also negate this security measure??
great video! on a high standart but still funny
Is the green glue gonna activate it
If the coil is damaged or not complete will the security sticker still set off the alarm?
no it has to complete the circuit
What's the value of this capacitor?
I need an answer to my question please .. is any scanner that can cancel the NFC sticker? I need a quick answer guys because I will be ordering tools soon for my project :(
I think the video of label is RF label.
What was the oscillator chip you used?
It was 74HC14. It is 6x Schmitt gate. One gate as oscillator, one as buffer and 4 in parallel as a power output stage.
Oh... I didn't know that was possible.
Hi, can you send me the schematic of the oscilator please? ...for example here: martas.letec@gmail.com
Look up schmidtt trigger oscillator
What about bottle of soda??
0:55 is my daily alarm
Nice 11 Pro
nice
so do they stay deactivated as soon as you scan them?
WHAT DID YOU SAY "SOMETIMES"
I’ll just use an emp
It would be interesting to see if they are affected by a magnet.
They are not, there is no magnetic material in these to saturate or so.
The whole thing responds just to changes of the magnetic field at (and arround) the resonant frequency. Does not matter what DC background is there. Only when ferromagnetic materials would be involved in the resonance, the strong DC magnet may saturate them so change the resonant frequency, but there is no such material in these.
Other story are those "plastic" tags the cashier is taking away. Those use a ferrite rod as the coil core (these operate at way lower frequencies), which may saturate when exposed to a strong field, so a strong magnet nearby may make them "invisible" for the door scanner. But needs really a strong field (the materials tend to saturate at about 0.5T, which is the field many high power electric motors operate with), did not tested that.
Ok now how do u remove them easy way??? Asking for a friend btw
Hi, I accidentally washed my shirt with this tag on. I had forgot to cut it before washing.
I found out why this alarm sometimes sounds out of nowhere when you enter the store, it's the NFC of the cell phone interfering, after all the NFC uses a coil
Actually NFS usually uses a completely different frequency, so it shouldn't react to these gadgets at all.
@@CoolKoon Those alarm towers whistling when I pass empty-handed disagree, but they only blow a whistle and it doesn't always happen
Can emp is use to damage the coil?
EMP is _precisely_ what deactivates the tag!
I design these. You do not need EMP to destroy it. Just cut with a blade it will damage the coil.
Just take a sharp pin and make some holes into the capacitor and the alarm will not be triggered.. simple as that 😁😂😂
[For educational purposes only don't misuse it 😂]