DefenderShield

Ultra Armor Cybersecurity & Privacy Key Fob Faraday Bag

$44.99 USD

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360° Ultra Armor® Faraday shielding completely blocks all incoming and outgoing wireless signals — cellular, 5G, WiFi, Bluetooth, GPS, RFID, NFC, and radio — up to 2.5 THz. Slide your key fob, credit cards, or other small trackable devices inside and they become undetectable. No signals in, no signals out. Ballistic nylon exterior, secure VELCRO closure, and an additional exterior pocket for non-shielded items. Sized to fit most standard key fobs.

Frequency Range RF (10 kHz - 2.5 THz)
Performance Advanced Protection
Flexibility Semi-Flexible
Best Application Best for when you don’t want to use a permanent EMF-blocking case for your device, but would still like protection when occasionally keeping your devices close by or on your body. Can be used with a range of small wireless devices for more versatility, and can store other accessories. Alternatively, when you wish to shield devices fully in a Faraday bag to block wireless RF hacking and EMP attacks, when your device is not in use in a public place or during travel.

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Good to know

This is a Faraday bag — it blocks all wireless signals in every direction. Any device placed inside will lose all connectivity: no cellular service, no WiFi, no Bluetooth, no GPS tracking, and no RFID scanning. The device is completely isolated from all wireless communication until you remove it from the bag. This is fundamentally different from DefenderShield’s directional products (phone cases, pouches, clothing), which block radiation on one side while keeping the device connected. The Faraday bag is designed for privacy, cybersecurity, and complete signal isolation — not for actively using your device.

Description
How to use
Specifications
Video

Description

Complete Signal Isolation — Nothing In, Nothing Out

🔒 360° Ultra Armor Faraday Shielding — Up to 2.5 THz

The interior of the Key Fob Faraday Bag is lined with Ultra Armor mult-layer shielding on all sides, creating a sealed enclosure that blocks every wireless signal from entering or leaving. Cellular, 5G (all bands including mmWave), WiFi, Bluetooth, GPS, RFID, NFC, and radio — all blocked. A key fob inside the bag cannot receive a relay signal from an attacker, cannot transmit its unlock code, and cannot be located by GPS or Bluetooth tracking. The device is electronically invisible until you open the bag and remove it.

Stop Key Fob Relay Attacks and Signal Cloning

🚗 Your Key Fob’s Signal Cannot Be Intercepted While Inside the Bag

Modern car key fobs transmit a wireless signal that unlocks and starts your vehicle. In a relay attack, a device near your key fob captures that signal and relays it to a second device near your car — unlocking the doors and starting the engine without the physical key. The Faraday bag eliminates this vulnerability by blocking the fob’s signal entirely. When the fob is inside the sealed bag, there is no signal to capture, relay, or clone. The same principle applies to RFID-enabled credit cards, access badges, electronic passports, and any other device that transmits wirelessly.

Built to Carry Every Day

🧳 Ballistic Nylon Exterior, VELCRO Closure, Exterior Pocket

The exterior is ballistic nylon — durable enough for keys, pockets, bags, and daily carry without showing wear. A heavy-duty Velcro closure seals the Faraday bag to block all signal entry instantly. An additional exterior pocket holds non-shielded items like keys, cash, or a card you want to access without opening the Faraday compartment. The bag weighs approximately 1.1 oz and measures 6” × 3.6” on the outside (5.5” × 3” interior), sized to fit most standard key fobs.

How to use

Basic Use

1. Open the VELCRO flap. Pull the flap open to access the Faraday-shielded interior compartment.

2. Place your key fob inside. Slide the fob into the interior compartment. The bag fits most standard car key fobs, building access fobs, and other small electronic devices.

3. Close the flap completely. Fully seal the VELCRO closure shut. The shielding only works when the bag is fully sealed — any gap in the closure allows signals to enter or leave. Confirm the flap is flat against the bag with no folds or wrinkles at the edges.

4. To use your key fob, remove it from the bag. Open the flap and take the fob out. It will reconnect to your vehicle’s receiver immediately. The Faraday bag blocks signals only while the device is inside and the bag is sealed.

What to Shield

• Car key fobs — prevents relay attacks, signal cloning, and unauthorized vehicle access

• RFID credit cards and debit cards — blocks wireless skimming of contactless payment data

• Building access badges and key cards — prevents cloning of access credentials

• Electronic passports — blocks RFID scanning of passport chip data

• Small GPS trackers or Bluetooth tags — blocks location transmission while inside the bag

Important Notes

• The bag must be fully sealed to work. If the VELCRO seal is partially open or folded, signals can enter through the gap. Ensure the closure is pressed flat and complete before relying on signal isolation.

• Devices inside the bag are completely offline. A key fob will not unlock your car from inside the bag. A GPS tracker will stop transmitting location. This is by design — Faraday shielding blocks all signals in both directions.

• Use the exterior pocket for non-shielded items. The outer pocket is not Faraday-shielded. Cards or keys placed in the exterior pocket remain accessible and scannable.

Care Instructions

• Wipe the exterior with a damp cloth. Allow to air dry.

• Do not machine wash, machine dry, or submerge the bag — the shielding layer can be damaged.

• Keep the VELCRO closure free of debris for a reliable seal.

• Store flat when not in use to preserve the bag’s shape and the integrity of the shielding lining.

Specifications

Shielding Specifications

Specification	Detail
Shielding Technology	Ultra Armor multi-layer Shielding Technology — 360° Faraday enclosure
Shielding Type	Complete signal isolation — blocks all incoming and outgoing wireless signals
Frequency Range	Up to 2.5 THz
Signals Blocked	Cellular (1G–5G all bands including mmWave) · WiFi · Bluetooth · GPS · RFID · NFC · Radio · EMP
EMP Protection	MIL-STD-461G
Device Connectivity	None while inside the sealed bag — all signals blocked
Testing & Verification	FCC-accredited lab tested for EMF shielding performance

Physical Specifications

Specification	Detail
Outer Dimensions	6” × 3.6” × 0.2”
Inner Dimensions	5.5” × 3” × 0.2”
Weight	~1.1 oz (0.07 lbs)
Exterior Material	Ballistic nylon
Closure	VELCRO seal
Exterior Pocket	Yes — one additional pocket (not Faraday-shielded)
Compatibility	Most standard key fobs and small electronic devices that fit within 5.5” × 3”
HSA / FSA Eligible	Yes — see if you qualify at checkout
Warranty	1-year manufacturer warranty

Video

Feature	DefenderShield Key Fob Faraday Bag	Generic RFID-Blocking Pouch
Signal blocking	360° Faraday — blocks all wireless signals (cellular, 5G, WiFi, Bluetooth, GPS, RFID, NFC, radio)	RFID only — may not block cellular, WiFi, Bluetooth, or GPS
Frequency range	Up to 2.5 THz — verified by FCC-accredited lab	Limited or unspecified
Key fob relay protection	Complete — fob signal fully isolated	Varies — may block RFID but not the wireless signal used in relay attacks
GPS/Bluetooth tracking	Blocked — device untrackable while inside	Typically not blocked
EMP shielding	Tested to MIL-STD-461G	No
Independent lab testing	FCC-accredited lab verified	Rarely — most claims self-reported
Exterior material	Ballistic nylon	Varies — often thin fabric or faux leather
Closure	Secure, leak-proof VELCRO seal	Varies
Exterior pocket	For non-shielded items	Varies
Medical Advisory Board	Full board	No
Warranty	1-year manufacturer	30–90 days typical
Returns	30-day full refund	Varies
Best for	Verified complete signal isolation for key fobs, cards, badges, and small devices	Basic RFID blocking — may not protect against relay attacks or tracking

5 stars: 5 (83%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 1 (17%)
1 star: 0 (0%)

Wow this works I went right next to car and inside car when inside faraday bag car doesn't recogn...

Wow this works I went right next to car and inside car when inside faraday bag car doesn't recognize key awesome thanks.

Safety and comfort!

I so enjoy using the faraday “bag” to secure my iPhone when going shopping and to areas with large crowds. I feel safer! And the “bag” is actually an envelope that fits my phone snuggly. No need to worry about all the tech devices that want to check my location in stores and elsewhere.

Hi Nancy,

Thank you for your review!

We are glad to hear you are enjoying your products and the protection it provides!

Best,

The DefenderShield Team

Cybersecurity & Privacy Key Fob Faraday Bag

Great. I had bought a cheaper fob faraday that didn’t work at all. I was able to open my car with the fob inside it. The Defender Shield key fob faraday makes the key fob completely indetectable. Works as it should.

Faraday Bag

First class - this bag is used to shield my car keys from detection by ‘criminal actors’ when not in use. It works absolutely as described.
I am totally satisfied.

Perfect products!

Excellent quality & performance!

Loved it initially...

I loved it initially! Then the second day, I used it and pulled the stitching off from under the closure piece. Now the inner RFID layer is exposed and is completely frayed. It still works great but now I have to be extra careful with it!

Hello Christina,

Thank you for contacting us. We apologize for the experience you are describing but are proud to offer a 1 Year Warranty policy on all of our products.

We invite you to please complete the Warranty Replacement Form located on our website for replacement consideration by our warranty department. Please be sure to complete all fields marked with a red asterisk or the form will not submit and please be sure to attach a clear photo illustrating the issue.

https://www.defendershield.com/warranty

Best regards,

The DefenderShield Team

All incoming and outgoing wireless signals. The Ultra Armor Faraday shielding creates a sealed enclosure that blocks cellular (1G through 5G including mmWave), WiFi, Bluetooth, GPS, RFID, NFC, radio, and EMP signals up to 2.5 THz. Nothing transmits in, nothing transmits out. Any device placed inside is completely isolated from all wireless communication.

It eliminates the wireless signal that relay attacks depend on. Your car key fob constantly broadcasts a short-range signal. In a relay attack, a thief captures that signal near your fob (even through walls) and relays it to a second device next to your car — unlocking the doors and starting the engine. Inside this Faraday bag, the fob’s signal cannot escape. No signal means no relay attack, no cloning, and no unauthorized access.

No — this blocks far more than RFID. Standard RFID-blocking sleeves block the specific frequencies used by contactless payment cards and passports. They do not block cellular, WiFi, Bluetooth, or GPS signals. The DefenderShield Key Fob Faraday bag blocks all wireless signals across the full spectrum up to 2.5 THz, which means it stops relay attacks on key fobs (which use frequencies that RFID sleeves do not cover), prevents GPS and Bluetooth tracking, and isolates the device from all wireless networks.

Yes — immediately. The Faraday shielding blocks signals only while the device is inside the sealed bag. The moment you remove the fob, it reconnects to your vehicle’s receiver and works normally. The bag does not alter, damage, or drain the fob in any way.

Any device that fits within the 5.5” × 3” interior. Common uses include car key fobs, RFID credit and debit cards, building access badges, electronic passports, small GPS trackers, and Bluetooth tags. The bag is sized for small devices — it will not fit a phone. For phone-sized Faraday bags, see the DefenderShield Cell Phone Faraday Bag.

A phone case is directional — a Faraday bag is full signal-blocking. DefenderShield phone cases shield radiation from one side (the front cover) while keeping the phone fully connected to cellular, WiFi, and Bluetooth. A Faraday bag shields in every direction and blocks all signals completely. The phone case is designed for daily use with an active device. The Faraday bag is designed for privacy, cybersecurity, and complete signal isolation when you do not need the device to be connected.

No. The exterior pocket is outside the Faraday-shielded compartment. Items placed in the exterior pocket are not signal-blocked — they remain scannable, trackable, and connected. Use the exterior pocket for items you want accessible without opening the Faraday enclosure, such as a spare key, cash, or a non-sensitive card.

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Designed by a Telecom Engineer.

DefenderShield was founded by Daniel T. DeBaun, a 30-year veteran of the telecommunications industry. Every product is engineered using shielding principles from military and industrial EMF protection, adapted for consumer devices.

Read the full DefenderShield story

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