by EDEC - Cell Phone Faraday Bag with Window - Signal Blocking, Anti-Tracking, Anti-Spying, EMP Protection for Cell Phones, Key Fobs and Credit Cards

Wanted a bag for some key fobs and this did the trick perfectly. It is about the size of a clutch purse and if I really stuff things in it, it can fit a set of keys, my phone, some credit cards, and a passport. I tested it out by putting the key fobs inside the bag and holding them next to the fob sensor -- they didn't trigger the sensor from inside the bag. Also tried streaming music on my phone then dropping it into the bag, which cut off the music completely. I've used the bag every day for the last couple months and the velcro has held up well to repeated use. I wish the bag did not have obvious markings or text on it because it would look a little more minimalist/stylish without. I do like that this was made in the USA and that makes me more confident in the quality of the liner.

Upon initial testing, this bag seems to work as advertised. I placed an FM radio receiver in this bag while tuned to a station and the radio went completely silent as soon as I placed it inside the bag, as soon as I pulled the radio out of the bag, the radio started playing again. I then tested with two walkie talkies with one walkie talkie in the bag, and the other walkie talkie outside the bag about 3 feet away. Although I did hear the walkie talkie in the bag when I transmitted on the other one, the signal was noticeably noisy and not clear. Basically it was equivalent to having the walkie talkies a mile apart from each other even though they were only 3 feet away. This means the bag is at least attenuating 99% of the signal which is impressive and should be sufficient. Next test I placed a cell phone inside the bag and when I tried to call it with another phone it would not ring and went to voicemail.

Forensic technologists and the privacy-minded will likely find this product to be useful, perhaps even VERY useful. Although no extensive, forensic testing and analysis resulted in this review, the bag does enable the user to visually verify signal loss. The curious (as well as the novice user) should take note that interacting with mobile devices that are secured inside the bag can be awkward and tricky, and that this particular model does not necessarily allow for the device to be connected to USB while inside the bag. There's a different model available for that. The bag itself is made of good, durable materials, has excellent seams and although the velcro will likely wear over time, it seems to do exactly what the description says it does. For those who simply want a little privacy, it's like a certain cartoon cat's "magic bag of tricks". Connections appear to drop the device completely off the grid, as also noted in other reviews here. Truth be told, I'd love to see a forensics expert's full and extensive opinion on exactly how sound this product really is. Tested on iPhone (1, 3, 3GS, and 4) and Android (HTC, Samsung) devices. Happy Mobiling (or Not?)! ;)

What I was looking for, good quality, slightly tight but does its works. I have a better sleep now

I looked at dozens of Faraday bags on Amazon before selecting this one, based pretty much entirely on the reviews. I was a bit apprehensive since this one is considerably more expensive than most. At the end of the day, it's a sheet of metal fabric wrapped in cloth. This bag exists for only one purpose: to block cellular RF signals from whatever's inside. Either it works as promised or it doesn't. As such, I tested it by dropping my phone in the bag, folding the top over twice as directed, and immediately calling it from another phone. The verdict? It worked. My phone could not be found by the cellular network and the call went to voicemail. A couple things to note: 1. The density and composition of the mesh fabric determines the range of radio frequencies that are blocked. I'm satisfied that the bag does indeed block common cell frequencies, and others have claimed that it also blocks the frequencies of wireless car key fobs. Beyond these, I wouldn't expect this bag to block devices like AM/FM radios, ham radios, walkie-talkies or the like. It may block Wi-Fi and/or Bluetooth; I haven't yet tested this. 2. Many people (including manufacturers) claim these bags also block GPS signals. Whether they do or not isn't really relevant since GPS signals are one-way: they fall from the GPS satellites onto your device, which computes your position based on the strength of signals received from multiple satellites. GPS-enabled devices do not transmit anything back to the satellites (in fact the satellites are not equipped to receive anything from customer devices -- they are one-way, transmit-only devices). If you're concerned about your device betraying your location, blocking the cellular signals is what you want. Once your device has computed its location via the GPS radio, that data can only be sent back to interested parties (such as apps, for example) via the cellular network, Wi-Fi, or in some cases a connected bluetooth device. If your device cannot be found on a cellular network or Wi-Fi network, your GPS-computed location cannot be leaked. The bag itself appears to be well made. The outer fabric and stitching looks strong. Not sure what the point is of the clear plastic pouches -- anything in these pouches will most certainly not be protected. Also, the "fold top over twice" business is messy and results in a sloppy looking bag. A better mechanism, even snaps or a buckle, would look better and be more secure. The bag's natural tendency is to unroll itself when fastened with the hook-and-loop mechanism. This tendency probably isn't strong enough to completely unroll, but it could have been avoided with a better fastening scheme.

Love it.

Good security and works!

Terrific product, important to own this item if security is a concern. Quality materials, well stitched made in America. My large cell phone fits inside with room to spare. Your device is completely invisible once inside, all signals are blocked, huge piece of mind ! A+++.

Bought this to put my car keys in it. Does indeed work. I even tried calling my cell phone within the bag, without success, which is good! :)

It works