Faraday Bag for Laptops & Tablets - 2 Pack 20 x 15 inches and 15 x 10 inches Faraday Cage, Faraday Key Fob Protector, Fireproof & Waterproof Key Fob Signal Blocker, RFID Pouch for Key Fob(Black)

Does it block RF signals yes. Does it block "all RF signals"? I don't know, but it does work. Pt your phone, tablet, or laptop in and close it properly and it basically black holes your device. It's well made of a thick rubberized outer material that seems to be very protective and the interior faraday cloth is soft and non scratchy. For best results though shut off your device that way it doesn't waist power looking for a signals to connect to. I'm probably going to get a couple more for our other devices and as gifts for some fellow "Contingency Planners".

We live in difficult times. My Kia Sportage was stolen in January, then in the shop for more than three months, waiting for parts! From reading on line, I’ve discovered that thieves can electronically capture your key code, if it is a remote control starter, even from your house. Lightening, which is very frequent with storms where I live, has already struck near my house once, tripping my solar energy panel breakers—it showed up when the City was preparing my bill, and the City staff noticed there was no reading from my solar panels, and called me. So I lost a month’s solar energy credit—worth about $70–$80. I was fortunate nothing else apparently was damaged, although my car panic alarm was set off, too!These devices, which are designed for computers, cell phones, and credit cards, and called “Faraday boxes” can shield objects inside from electromagnetic forces.Given my extremely bad luck history, I decided these would be a good investment—at least I feel I’m taking back some semblance of control!I use the car key protector regularly, taking the key fob out only to lock or unlock my car. I keep each of my three credit cards in its own Faraday folder. Seems common in Austin, Texas, to have somebody hack into people’s credit or debit cards, at certain locations!Another issue: Lightning striking a house emits a powerful electromagnetic pulse, which could fry everything electric or electronic in the house! (This happened once to my parents, in Prairie Village, KS.) Solar flares are occasionally strong enough to knock out electrical power—but usually much farther north! So I bought these products as at least SOME protection from lightning, and sophisticated thieves. I’m happy with my choices. The price was inexpensive for the peace of mind.I don’t know—somewhat doubt—these devices would be sufficient to withstand an atomic bomb overhead explosion. I hope to God that never happens, but the risk is non-zero. Thus, some of the more expensive options—considered “military grade.” In the (unlikely) event that a nuclear explosion was detonated over some part of the United States, an electromagnetic pulse generated, would be so powerful as to cripple a large part of the country; everything dependent on electricity or electronics which hasn’t been “hardened” against attack would stop working. The military, and certain other key city and state facilities must be hardened against this possibility. It’s too expensive, though, for most of us to afford to take countermeasures.For my budget, for now, I’m happy with the products I bought. I use the key fob protector and credit card sleeves all the time. I put the computers and iPhone in their bags during thunderstorms; much cheaper than having to replace them, I figure.Should every one have these Faraday boxes? Your decision; after my experiences with my car in the last year, plus having my house at least VERY CLOSE to a lightning strike recently, I’m feeling risk adverse!By the way, your microwave can act as a Faraday device; it’s a cheap way to store your iPad and iPhone; maybe an expensive camera, out of harm’s way during a storm! I travel occasionally, so the bags will be useful then, when my microwave isn’t available! You can make your own Faraday boxes, out of aluminum foil, if you would rather save money. But, then you start looking a bit daft to strangers, and have to do a certain amount of testing, to be sure your design is effective! I like the design of these products, which fold over, in most cases, completely encasing what’s inside. They are well-designed, and should hold up for the foreseeable future. Aside from nuclear attack, I believe they will provide the protection needed from lightning and sophisticated thieves. Quite extensive information about electromagnetic forces is readily available online.

This works so well that I ordered more. Good value for the money.

These will block signals while they are on your device. However be aware that they will not block sound and if someone is already hacking your devices they will still be able to retrieve information once you take The device out of the signal blocker. So it really only works to keep stuff out for devices that have not already been compromised.

I can now have assurance of protecting my electronic products from an Electro Magnetic charge, which could cause damage. I also think that by providing a safe storage with these products, that it may protect them to continue to operate properly.

I gave it 1 star because there is no way to give it zero stars, or better yet, negative-five-stars.I am a digital security professional and I bought several of these bags for my team, and others related to my team. I did some very simple, rudimentary tests you can also do yourself to evaluate this. Please verify this on your own. I used a very standard phone, the Google Pixel 6 Pro (but you can use any cell phone), and I got its local IP address on my wifi. I began repetitively pinging it (command line in Windows: "ping -t A.B.C.D" where A.B.C.D is the IP of your phone, you will probably see something like 192.168.1.101 or similar for your phone. If you login to your router you can find the IP of your phone most likely). The phone was successfully returning the pings, as expected, proving it was on my network, as desired. I placed the phone in the 15x10 bag and sealed it properly. The phone continued to return pings. At this point, it SHOULD have been unable to talk on the wifi, because it was properly sealed in the bag. This is the WHOLE purpose of this bag! I rolled up the remainder of the bag around it, and it was still pinging. I placed the entire thing inside the second bag and only after I sealed it properly did it stop returning pings. I compare this with other brands of faraday bag that I have obtained in the past, also available here on amazon (EDEC), and those bags worked correctly and perfectly every time. I tested SEVERAL of these Hodufy bags I had purchased here, NONE of them were able to protect the phone from wifi in just a single bag as you would want it to! This is 100% UNACCEPTABLE! People are EXPECTING THIS BAG TO WORK! If you are trying to protect yourself electronically, THIS IS A TOTALLY FALSE FALSE FALSE SENSE OF SECURITY. Please buy a different brand, you will regret buying the Hodufy brand.I have several HackRFOne units that I will also be reprogramming to test across all the wifi and cellular bands and make sure that all of my other bags are protected. But this bag fails to protect from even the most simple, rudimentary usage case, and you and your friends can verify this for yourself at home!