EMF protection
Key Fob Faraday Bag | Signal Blocking Car Key Protection | Made in the UK
Key Fob Faraday Bag | Signal Blocking Car Key Protection | Made in the UK
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Protect Your Vehicle from Keyless Entry Theft and Relay Attacks
Modern keyless entry systems make accessing your vehicle quick and convenient, but the same wireless signals that unlock your car can be exploited. Relay attacks - where thieves use electronic equipment to amplify and capture your key fob's signal - are an increasingly common method of vehicle theft, and standard key cases offer no protection against them.
The Leblok Security Key Fob Faraday Bag acts as a Faraday cage for your car keys. When correctly sealed, it physically isolates your key fob from external radio signals, helping to protect against relay attacks, key cloning and accidental vehicle unlocking.
Manufactured in the UK and built for everyday use, the Leblok Security Key Fob Faraday Bag combines high-quality construction with dependable signal isolation. Whether you keep your keys at home, carry them in your pocket or travel regularly, it provides a simple and effective way to prevent your key fob from communicating until you choose to remove it.
Unlike an ordinary key case or pouch, a Faraday bag - sometimes referred to as a Faraday cage pouch - creates a physical barrier between your key fob and external wireless signals, helping to prevent communication while the bag remains securely sealed.
Designed for Car Key Fobs
The Key Fob Faraday Bag has been developed to accommodate most vehicle key fobs while remaining compact enough for everyday use.
External Dimensions (Closed): 140 × 120 mm
Suitable for:
- Most vehicle key fobs
- Keyless entry remote controls
- Garage door remote controls
- Small RFID-enabled devices
- Other compatible electronic devices
Need to isolate your mobile phone as well? See our Faraday Phone Bag, available in Medium and Large sizes.
See the Key Fob Faraday Bag in Action
What Can a Key Fob Faraday Bag Be Used For?
A Key Fob Faraday Bag offers a simple way to physically isolate your key fob from external wireless signals whenever you choose.
The Leblok Security Key Fob Faraday Bag can help you:
- Help protect against relay attacks and keyless entry car theft.
- Help prevent unauthorised key fob communication.
- Help reduce the risk of key cloning.
- Help prevent accidental vehicle unlocking caused by unintended button presses.
- Physically isolate your key fob from external radio signals while it remains inside the bag.
- Shield compatible RFID-enabled devices from unwanted communication.
- Provide an additional layer of protection against electromagnetic pulse (EMP) events.
Simply place your key fob inside the bag, fold the opening twice and fasten the security strap. Your key fob remains physically isolated until you choose to remove it.
Why Choose Leblok Security?
Shielding is at the core of what Leblok does.
Long before introducing the Leblok Security range, Leblok established itself as a specialist manufacturer of EMF shielding clothing and protective products trusted by customers around the world. The same understanding of RF shielding materials, construction techniques and quality control has been carried directly into every Faraday bag we make.
The Leblok Security Key Fob Faraday Bag incorporates a high-performance RF shielding layer together with durable waterproof outer material and reinforced stitching to provide dependable signal isolation and long-term durability.
Every Leblok Security Key Fob Faraday Bag is manufactured in the UK and individually inspected before leaving our factory, because dependable signal isolation relies not only on the shielding material but also on the quality of the finished construction.
Built for Everyday Reliability
The effectiveness of a Faraday cage bag depends on much more than simply using shielding fabric. Every Leblok Security Key Fob Faraday Bag combines carefully selected materials with precise manufacturing techniques to produce reliable, long-lasting performance.
Features include:
- High-performance RF shielding layer
- Waterproof outer fabric
- Reinforced stitched construction
- Secure hook-and-loop fastening
- Dual-fold closure designed to minimise signal leakage
- Durable construction for repeated daily use
Every detail has been developed to deliver dependable performance while remaining compact and convenient to carry every day.
Independently Tested Shielding Material
Confidence in shielding performance should be based on independent testing rather than assumptions.
The RF shielding material used in the Leblok Security Key Fob Faraday Bag has been independently tested by the University of the Armed Forces (RF, Microwaves and RADAR Department), Germany, in accordance with internationally recognised standards:
- ASTM D-4935-10
- IEEE 299-2006
Testing demonstrates excellent shielding performance across a wide range of frequencies used by today's wireless technologies. Detailed laboratory test results are provided below.
| Frequency | Shielding | Standard |
|---|---|---|
| RFID 13.56 MHz | 80 dB | ASTM D-4935-10 |
| C-Net, TETRA, 450 MHz | 80 dB | ASTM D-4935-10 |
| D-Net, GSM900, 900 MHz | 83 dB | ASTM D-4935-10 |
| E-Net, GSM1800, 1800 MHz | 85 dB | ASTM D-4935-10 |
| Bluetooth, WLAN 2450 MHz | 84 dB | ASTM D-4935-10 |
| 5G (Sub 6GHz Band) 3.4–3.8 GHz | 85 dB | ASTM D-4935-10 |
| W-LAN New Generation 5.8 GHz | 75 dB | ASTM D-4935-10 |
| 7.5 GHz | >42 dB | IEEE 299-2006 |
| 10.0 GHz | >42 dB | IEEE 299-2006 |
| 12.5 GHz | >42 dB | IEEE 299-2006 |
| 15.0 GHz | >42 dB | IEEE 299-2006 |
| 18.0 GHz | >42 dB | IEEE 299-2006 |
| 30 GHz | >52 dB | IEEE 299-2006 |
| 35 GHz | >52 dB | IEEE 299-2006 |
| 40 GHz | >52 dB | IEEE 299-2006 |
Protection Against Common Wireless Technologies
The Leblok Security Key Fob Faraday Bag helps isolate compatible devices from a range of wireless technologies, including:
- RFID
- Keyless entry systems
- Remote locking systems
- Bluetooth
- Mobile communication frequencies
- Other compatible RF signals
It also helps to protect compatible electronic devices against electromagnetic pulse (EMP) events.
Simple to Use
- Place your key fob inside the bag.
- Fold the opening over twice.
- Secure the fastening strap firmly.
Your key fob is now physically isolated from external wireless communication until removed.
Product Specifications
Product: Leblok Security Key Fob Faraday Bag
External Dimensions (Closed): 140 × 120 mm
Manufactured in: United Kingdom
Construction:
- High-performance RF shielding layer
- Waterproof outer fabric
- Reinforced stitched construction
- Dual-fold closure
- Secure hook-and-loop fastening
Who Is the Key Fob Faraday Bag Ideal For?
The Leblok Security Key Fob Faraday Bag is ideal for people who:
- Own vehicles with keyless entry systems and want protection against relay attacks and keyless entry theft.
- Want to reduce the risk of key cloning and unauthorised wireless access to their vehicle.
- Prefer to prevent unnecessary communication between their key fob and vehicle when the key is not in use.
- Wish to protect RFID-enabled devices from unwanted communication.
- Appreciate products manufactured to high quality standards for long-term use.
Frequently Asked Questions
Yes. A Faraday bag works by using a layer of RF-shielding material to create a conductive enclosure - the same principle as a Faraday cage - that blocks external radio signals from reaching the devices inside. When the Leblok Security Key Fob Faraday Bag is correctly sealed using the double-fold closure, it physically isolates your key fob from external radio signals. This prevents normal wireless communication between the key fob and external devices while it remains inside the bag, helping to protect against unauthorised key fob communication, relay attacks and accidental vehicle unlocking. The shielding material used in this bag has been independently tested and the results are detailed on this page.
When the Leblok Security Key Fob Faraday Bag is correctly sealed, the key fob is isolated from the vehicle's wireless communication. Your vehicle should therefore not be able to communicate normally with the key fob while it remains inside the bag, which means a relay attack - the most common technique used to steal keyless entry vehicles - cannot be carried out.
It is important to ensure the bag is properly sealed using the double-fold closure. If the bag is not correctly sealed, effective signal isolation cannot be expected.
Keyless vehicle theft via relay attack works by using two electronic devices: one placed near the key fob inside the home, and one near the vehicle. The devices amplify and relay the key fob's signal to trick the car into thinking the key is nearby, allowing the vehicle to be unlocked and started.
A correctly sealed Faraday bag creates a shielding barrier - acting as a Faraday cage - around the key fob, blocking external radio signals from reaching it. By physically isolating the key fob when it is not in use, the bag helps prevent the signal from being captured and relayed.
The best Faraday bag for car keys is one that combines independently tested shielding material with reliable construction - because no amount of shielding fabric will protect your key fob if the closure leaks or the bag deteriorates quickly with daily use.
The Leblok Security Key Fob Faraday Bag uses RF shielding material independently tested by the University of the Armed Forces (Germany) across a wide range of frequencies, and is manufactured in the UK with reinforced stitching and a dual-fold closure specifically designed to minimise signal leakage.
The Key Fob Faraday Bag is suitable for most vehicle key fobs and keyless entry remote controls. External dimensions (closed) are 140 × 120 mm.
The key fob must fit comfortably inside the bag while still allowing the opening to be folded twice and securely fastened. If the bag cannot be correctly sealed, effective signal isolation cannot be expected.
Place your key fob fully inside the bag, fold the opening over twice and secure the fastening strap firmly.
The double-fold closure is an important part of the shielding system. Make sure the opening is properly folded and secured whenever you want to isolate the key fob. Effective shielding cannot be guaranteed if the bag is left partially open or the strap is not fastened.
This is one of the most common uses for a key fob Faraday bag, and many security advisors recommend it. Relay attack equipment can capture signals through walls and windows, so keeping your key fob inside a correctly sealed Faraday bag when parked at home - especially if the vehicle is close to the house or on the street - helps prevent the signal from being exploited.
The Leblok Security Key Fob Faraday Bag can be used whenever you want to keep your key fob physically isolated from external wireless signals, whether at home, at work or while travelling.
Yes. When correctly sealed, the bag helps isolate compatible devices from a range of radio-frequency signals, including RFID (tested at 80 dB attenuation at 13.56 MHz) and other wireless communication signals within its shielding range.
Full independent test results across all tested frequencies are provided in the table on this page.
Once the key fob is removed from the Faraday bag, it can communicate with the vehicle normally again. You can keep the key fob isolated while it is not needed and remove it when you want to unlock, lock or start your vehicle, depending on the type of keyless system your vehicle uses.
