EMF & Faraday Knowledge Base
Everything on this site's topic in one place: how Faraday bags and cages actually work, what EMF is and how to measure it honestly, how to protect your car from relay theft, and which product fits which job. No fear-marketing, no invented lab numbers — where something is uncertain or unverifiable, we say so.
Start Here
In a hurry? Use the Bag Finder — tell it what you want to protect and it points you to the right product in one click.
New to all of this? Read these four in order and you'll know more than most people selling shielding products:
- What is a Faraday Bag? — the 5-minute foundation
- Does a Faraday Bag Really Work? — and how to test one yourself
- Why Do You Need a Faraday Bag? — the practical use cases
- Best Faraday Bags by Use Case — our honest picks
Faraday Technology
The physics and the practice — what shielding is, why it fails, and how to build your own.
- What is a Faraday Cage?
- What is the Purpose of a Faraday Bag?
- Why Do Faraday Bags Stop Working?
- How to Make a Faraday Cage: The Ultimate Guide
- How to Make a DIY Faraday Bag: Step-by-Step
- How to Build a Faraday Shield
EMF Basics & Measurement
What electromagnetic fields are, how to measure them with a meter (which measures — never blocks), and what the science does and doesn't say.
- How to Measure EMF at Home: A Beginner's Guide to EMF Meters
- 5G EMF Shield: Do You Need One? Facts vs Fiction
- EMF Protection During Pregnancy: What You Need to Know
- EMF Clothing & Accessories Guide
Car & RFID Security
RFID Skimming: What the Data Actually Shows — sourced fraud data, and when RFID blocking is worth it.
Relay Car Theft: What the Data Actually Shows — sourced statistics & independent testing.
Keyless-entry relay theft is the most concrete, well-documented problem Faraday products solve.
- Best Faraday Bags for Car Keys: What Actually Stops Relay Theft
- Protect Your Car with a Faraday Bag for Key Fobs
Digital Privacy & Preparedness
- Why Do You Need a Faraday Bag?
- Top 10 Uses of Faraday Bags You Didn't Know About
- The Ultimate Guide to Faraday Bags for Phones
- Faraday Bags for Tablets
- EMP Faraday Bags for Electronics & Documents
- The Faraday Bag 4-Pack: Covering Every Device
Buying Guides & Comparisons
- Best Faraday Bags for Phones (2026)
- Best Faraday Bags 2026 — Picks by Use Case
- Mission Darkness vs GoDark vs SLNT vs The Faraday Bag
- Best Faraday Bags in 2026
- Best Privacy Gifts in 2026
Compare Us to Other Brands
Mission Darkness alternative · GoDark alternative · SLNT alternative · Full four-way comparison
Shop by Category
Faraday Bags · Key Fob Protectors · RFID Blocking · EMF Meters · EMF Apparel · Fireproof Bags
Evidence & Data
Sourced reference pages — every figure attributed to a named authority and linked, including the parts that argue against buying from us. Journalists and editors are welcome to cite them.
- Relay Car Theft: What the Data Actually Shows — ADAC vehicle testing + NICB theft figures.
- UWB Keyless Entry: Does Your Car Still Need a Pouch? — why UWB defeats relay attacks, and how to test yours.
- RFID Skimming: What the Data Actually Shows — UK Finance fraud data, and why remote card skimming is close to undocumented.
- Phone Tracking: What a Faraday Bag Blocks (and What It Doesn't) — Apple's own Find My documentation.
- 5G EMF: Facts vs Fiction — what WHO, ICNIRP and IARC actually say.
Glossary
Met an unfamiliar term? The EMF & Faraday Glossary defines every one in plain English — from attenuation to wavelength.
How We Write
We sell shielding products and write these guides, so we publish our editorial rules openly: How We Write & What We Don't Claim — no health promises, no invented lab numbers, and how to test every claim yourself.
Questions?
Every product page has its own FAQ, and most guides above answer the common questions in context. Can't find your answer? Contact us — we answer plainly, including when the honest answer is "our product doesn't do that."
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