Mission Darkness™ Faraday Bag for Keyfobs (2-Pack)

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Mission Darkness keyfob faraday bag protects vehicles from relay hack remote access

The #1 Trusted Security Measure for Preventing Keyfob Signal Amplification

SKU: MDFB-K — Now Available as a 2-Pack!

Malicious vehicle entry using keyfob signal boosting methods is the leading threat in the automotive community. Criminals are using signal amplification devices to boost or mimic a keyfob's signal to gain access to automobiles without any forceful entry. The Mission Darkness™ Keyfob Shield is a high quality faraday bag designed to keep vehicles secure by blocking the fob's signal from communicating with the vehicle. It's built with a durable and water-resistant ballistic nylon outer material, and the interior includes three layers of high-shielding TitanRF™ Faraday Fabric on all sides with dual paired seam construction.

The faraday bag works by shielding "always-on" keyfobs and other small electronics (like Apple Watch, transmitters, and credit cards) from radio frequency signals, ensuring that the device cannot get hacked and the signal it constantly emits cannot be boosted. The bag should be used as a preventative measure for vehicle and data security. The bag also allows you to keep a spare keyfob isolated and locked inside your vehicle. The advanced signal blocking bag is commonly used for vehicle security, forensics, military, executive travel, data privacy, and personal security. The capacity is large enough to fit two fobs, or an average set of keys with accessories. The keyfob should remain inside of the faraday bag at all times (when not in use) to ensure your vehicle security.

See How to Prevent Signal Relay Hacking

mission darkness key shield faraday bag blocks rf signals prevent vehicle theft fab signal amplification


  • NEWLY IMPROVED 2-PACK VERSION - Gen 2 version includes two faraday bags in each set!
  • Faraday bag designed for vehicle security and data protection of small devices; also used to block RF signals for forensics, military, executive travel, personal security, and EMP protection
  • Prevents relay hacking and digital car theft
  • Keyfob size bag can accommodate two fobs, or single fob plus keyring accessories
  • Three layers of high-shielding TitanRF Faraday Fabric on all interior sides with dual paired seam construction (TitanRF Faraday Fabric is lab tested and certified to shielding effectiveness standards MIL STD 188-125 and IEEE 299-2006)
  • Water-resistant ballistic nylon outer materials
  • Blocks WiFi (2.4 and 5GHz), Bluetooth, cell signals including 5G networks, GPS, RFID, NFC, and radio signals from low MHz to 40GHz
  • EMI, EMR, and EMF radiation shielding
  • Belt loop on back side for hands-free access
  • Keyring loop to attach a keyring or carabiner
  • Unique serial number on every bag
  • Easy to access "fold and tuck" closure style

Commonly Used to Shield

  • Keyfobs
  • Building access cards
  • Credit cards
  • Small phones
  • Smart watches
  • Transmitters
  • WiFi cards
  • Thumb drives


  • External dimensions when closed: 5" x 3.25" x 0.25"
  • Internal usable dimensions: 4.5" x 3"

Simple to Use

Simply place fob or device completely inside the bag, fold the top over and tuck under elastic band for instant signal isolation. Device signals cannot penetrate the bag while properly enclosed inside.

Blog Post

Read the blog post about mysterious car thefts across the world, and how to get protected with the Mission Darkness Keyfob Faraday Bag.

Mission Darkness keyfob faraday bag signal blocking anti-hacking key sleeve prevent relay hacking car theft

Customer Reviews
4.5 Based on 24 Reviews
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robert v.
United States

Losing effectiveness

Worked great when first purchased but then gradually lost effectiveness until now we don't have to remove the keyfob to open or start our car. Also, the sewn in belt loop on the bag is poorly thought out/designed. If you put a snaplink in the loop for quick attachment to your jeans, the bag tends to turn upside down if you're too active or in certain situations. Several times my keyfob fell out of the bag and onto the floor. The bag remains effective at distance but the closer we get to our car we can see it's not.

United States United States

Key Fob Bag

I use this bag for my SunPass Pro toll device. I do not keep it in my window...and I don't always want to take money or my trips off that account. I have never had a toll charge when the transponder is safely tucked away in this pouch. It can not be scanned and cloned inside this pouch either. Would like another 1/2 to 3/4 of an inch in length for my purpose, but I make it work.

Dana R.
United States United States

Keyfob Bag

Very heavy duty and sewn very well. Bag works so well that I can’t leave it in while I’m in my car. I will get an alert that the fob is not inside. I would buy again.

United States United States



United States United States

Mission “Accomplished”

These key fobs work wonderfully and have exceeded expectations. They are constructed well and can take rough handling without discernible wear. I highly recommend the Mission Darkness Faraday Bags for key fobs.