2 Best Relay Attack Blocking Pouches for Older Vehicles

If you drive an older vehicle with a keyless entry system, you might be vulnerable to relay attacks where thieves amplify your key fob’s signal to unlock and start your car. A simple Faraday pouch can block these signals and give you peace of mind.

This guide compares two effective solutions: a portable Faraday bag for your key fob and a waterproof relay box for your vehicle’s electrical system. You’ll learn which one fits your needs best.

Mission Darkness Faraday Bag for Keyfobs – Signal Blocking Shield

The Mission Darkness Faraday Bag is specifically designed to block relay attacks on your key fob. It uses military-grade shielding (MIL STD 188-125 and IEEE 299-2006) with three layers of TitanRF Faraday Fabric, ensuring your fob’s signal cannot be boosted or copied by thieves. Simply place your key inside, and the bag acts as a secure barrier, preventing unauthorized access to your vehicle.

Beyond vehicle security, this bag is versatile. It can also protect RFID cards, block EMF, and prevent device hacking or tracking. The quality construction means you get reliable performance every time, making it a practical investment for anyone with a keyless entry system.

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• ✅ OFFERS VEHICLE SECURITY – Primarily used to prevent the signal relay hack (blocks thieves from copying or boosting your wireless fob code to access and steal your vehicle). Signal isolation also allows you to keep a spare keyfob in your car without your car knowing it.
• ✅ MULTIPLE APPLICATIONS – In addition to protecting vehicles, the bag can also be used to safeguard cards with RFID chips and transmitters, block EMF, prevent device hacking, tracking, spying, and chain of custody corruption. Shields keyfobs, transmitters, WiFi cards, IDs, credit cards, thumbdrives, smart watches, and other small devices from wireless signals.
• ✅ MILITARY GRADE SHIELDING – The Mission Darkness Keyfob Faraday Bag offers forensic-grade shielding (MIL STD 188-125 and IEEE 299-2006 shielding effectiveness confirmed with full test reports, available upon request). Blocks WiFi (2.4 & 5GHz), Bluetooth, cell signals including 5G networks, GPS, RFID, and radio signals from low MHz to 40GHz.
• ✅ QUALITY CONSTRUCTION – Three layers of high-shielding TitanRF Faraday Fabric on all sides with dual paired seam construction ensures signal loss. The exterior is constructed with durable and water-resistant ballistic nylon. Secure closable flap with elastic for easy access, belt loop, and unique serial number on every bag.
• ✅ 2 BAGS INCLUDED – Universal fit accommodates full keychains and small devices. Internal usable dimensions: 4.5" x 3" (11.43cm x 7.62cm). *MEASURE YOUR KEYSET PRIOR TO PURCHASING TO ENSURE IT WILL FIT!

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True MODS 12V Waterproof Fuse Relay Box – Durable Wiring Organizer

The True MODS 12V Automotive Waterproof Fuse Relay Box is a different kind of relay solution. Instead of blocking signals, it helps you organize and protect your vehicle’s electrical relays and fuses. With six relay sockets and six fuse holders, you can remap your wiring to keep multiple circuits tidy and secure. This is especially useful for older vehicles where wiring may be messy or exposed.

Built with durable nylon 66 and an IP65 waterproof rating, this relay box is designed to withstand harsh conditions. The unique Z-shaped brackets allow you to mount it almost anywhere, and the complete kit includes everything you need for installation. While it doesn’t block relay attacks directly, it ensures your electrical system is protected and reliable.

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• REMAP YOUR WIRING – organize, consolidate, and keep track of multiple independent circuits with six relay sockets and six fuse holders.
• MULTI-TRERRAIN – Our unique "Z" shaped brackets make it possible to securely mount this waterproof relay box just about anywhere.
• BUILT LIKE A TANK – Made from durable and dependable nylon 66 and sporting an IP65 waterproof rating, our relay box dosent understand the word "can't."
• A COMPLETE KIT – Box, brackets, seals, terminals, we've included everything you will need to sucessfully install your new waterproof relay box.
• MORE THAN A WARRANTY – We've got you covered with an industry leading two-year warranty and the best customer support in the business.

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Buyer’s Guide: What to Consider

When choosing a relay attack blocking solution for your older vehicle, consider these key factors to make an informed decision.

• Signal Blocking Capability: Look for pouches with verified shielding effectiveness, like MIL STD or IEEE standards, to ensure they block relay attacks.
• Material Quality: Choose products made from durable materials like nylon or multiple layers of shielding fabric for long-lasting protection.
• Water Resistance: If you plan to use the pouch outdoors or in harsh conditions, check for waterproof ratings like IP65 to prevent damage.
• Versatility: Consider whether the product can also protect other items like RFID cards or transmitters, adding more value for your money.
• Ease of Use: Ensure the pouch or box is easy to use daily, such as quick access for your key fob or simple installation for wiring.

Conclusion

Both the Mission Darkness Faraday Bag and the True MODS Relay Box serve distinct purposes. The Faraday bag is ideal for blocking relay attacks on your key fob, while the relay box focuses on organizing and protecting your vehicle’s electrical system.

For most drivers, the Mission Darkness bag is the essential choice to prevent theft. If you also need to upgrade your wiring, the True MODS box is a solid addition. Choose based on your primary security need.