Your Cart is Empty

June 05, 2024 3 min read




What’s a Faraday Bag?

Faraday bags are a simple and convenient way to protect electronic devices from interference.

They’re named after Michael Faraday, an English scientist who made a number of breakthroughs in the field of electromagnetism.

Most Faraday bags use copper mesh to protect from radio frequencies and electromagentic signals. It’s like a physical Airplane Mode for your phone or any other device within the bag.

You can use a Faraday bag to protect any electronic or Internet-connected device. A Faraday bag will block your phone’s GPS signal, your credit card’s NFC chip, and the Bluetooth signal to and from your Bluetooth enabled crypto hardware wallet.


Who Should Buy a Faraday Bag

  • Anyone with a smart remote control for their car who wants to protect themselves from hacks or theft
  • Owners of Bluetooth-connected hardware wallets who want to protect their crypto holdings to the highest degree
  • Individuals or organizations who are concerned about privacy and tracking
  • Anyone who just wants extra peace of mind

Signal Killer Basics

Signal Killer front

Signal Killer Faraday bags are produced by Privacy Pros, the same company behind the Billfodl.

Signal Killers come in two sizes: large and small. Today, we’ll be reviewing the larger size, which is big enough to fit multiple phones, a hardware wallet or two, as well as your key fob.

Signal Killer with ledger and yubikey


The large Signal Killer Faraday bag currently retails for $17.95, down from $25.00. Even at full price, it’s still one of the most affordable options on the market. A comparable size from Mission Darkness costs three times as much: $75.00.

You can also get a bundle for $24.95, which gets you both the large and small Signal Killer bags.

The Signal Killer has a 30-day return policy, so you can spend a month trying it out and seeing how well it meets your needs. Shipping within the U.S. is free for orders over $40.

Since Privacy Pros is a crypto-focused site, it makes sense that you can pay with Bitcoin, Ethereum, Monero, even Dogecoin and many other cryptocurrencies. Despite the convenience of this, it’s still not a feature that all crypto retailers provide yet. That’s a win for Privacy Pros.


Let’s get hands-on with the Signal Killer Faraday bag.

The Silent Pocket’s exterior is made of water-resistant ballistic nylon. There’s a pocket on the front where you can insert a card describing the contents of the pouch, or anything else you like.

Signal Killer front pocket

The interior is a metallic silvery woven mesh of triple-ply highly shielding fabric, with double seam construction on every edge.

Signal Killer interior

This material blocks WiFi (2.4 & 5GHz), Bluetooth, cell signals (4G LTE+), GPS, RFID, and radio signals with an average of 60-80dB attenuation.

The Signal Killer has two velcro strips that run the entire width of the bag. To seal the bag and effectively block out all signal, you simply roll the top of the bag down and fasten it with the velcro.

Signal Killer rolled

The design of the bag ensures that there are two layers of signal-blocking material held together when the bag is closed.

There’s a transparent plastic window on the back of the bag that lets you check your device to ensure it’s not receiving any signal.

Signal Killer window

Overall, there’s not a fault to be found with the Signal Killer’s design.

Signal Killer Support

Signal Killer with card

Privacy Pros has an easily-accessible contact form on their website, where you can reach out if you have any questions about the Signal Killer.

Another bonus is the free 10 year warranty that comes with each Signal Killer Faraday bag. Plus, after registering your purchase you’ll get an additional 25% off your next order.

The Privacy Pros Signal Killer is the gold standard Faraday bag. It’s well made, comes with a ten year warranty, and its secure velcro fastening ensures that the pouch will stay closed when you need it most.

If you’re looking to protect your electronic devices from all sorts of interference, you really can’t do better than the Signal Killer Faraday bag.

We give the Signal Killer a score of 9.4 out of 10.


Is the Silent Pocket safe?

The Silent Pocket will do a great job of protecting your electronic devices from radio wave and electromagnetic radiation. It’s cheap, large, well-made, and comes with a 10 year warranty for extra peace of mind.

Which is best - Silent Pocket, Signal Killer, or Mission Darkness?

All three Faraday bags are quite similar, and the signal-blocking materials they use all do the trick. However, they each have different fastening mechanisms. The Mission Darkness uses a simple elastic band, while the Silent Pocket uses more secure press-studs. But the Signal Killer uses velcro, which seals the bag completely and minimizes the risk of it opening unexpectedly and allowing electromagnetic interference to enter. For this reason, the Signal Killer Faraday Bag is our pick.