The Best Car Key Signal Blocker 2023

Keyless car crime is a huge problem in the UK and it’s on the rise. However, by using one of the many car key signal blockers on the market, you can make the criminal’s life much harder and block the signal they require for using their relay attack devices.

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Best Car Key Signal Blocker
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If you require a quick answer, the best car key signal blocker is the MONOJOY Bag, which features a new and improved design that’s made from PU leather. It’s suitable for all key fob sizes and it effectively blocks all signals from leaving the Faraday bag. However, if you would prefer to use a Faraday box, the Todoxi Box is the best alternative for multiple keys.

To rate the car key signal blockers within our roundup, we based our recommendations on testing, our experience using multiple signal blockers, the latest research and several factors. Some of the factors that we considered included their size, construction quality, design, ease of putting your key into the bag or box, warranty and value for money.

Best Car Key Signal Blocker Overview

Due to the new wave of keyless car crime, many car owners are having to find additional ways to protect their pride and joy against tech-savvy criminals. As shown in the overview above, there are many types of car key signal blockers to choose from and they all aim to block any signals passing outside of the pouch, pot, box or key ring.

Below is a list of the best car key signal blockers that block all key fob signals and are convenient to use.

The Best Car Key Signal Blockers

1. Best Faraday Pouch: MONOJOY Faraday Bag

By far the most popular car key signal blocker is the MONOJOY Faraday Bag, which features a new and improved design. It’s constructed of high-quality PU leather and is designed to hold every type of key fob available in the UK.

Along with blocking key fob signals, it’s also able to block calls, SMS, Wi-Fi, 4G, Bluetooth, RFID, NFC and much more.

  • High quality leather pouch design
  • Supplied with two bags
  • Blocks a wide range of other signals
  • Available in alternative designs
  • Tried and tested in the UK
  • We found that the leather began to wear out after a year of use

To conclude, the MONOJOY Faraday Bag is an excellent all-round option that ticks all the boxes and is very convenient to use. It also comes in a twin pack for extra bang for your buck, which you can use to protect your spare keys.

2. Best Value: Defender Signal Blocking Faraday Pouch

Another similar car key signal blocker is the Defender Pouch, which is available in black, pink or grey. In terms of the design, it’s compatible for storing all smartphones, credit cards and a wide range of key fobs.

According to the brand, their car key signal blocker is designed and manufactured using the latest specialist RPF material for maximum safety. It also meets the “Secured By Design Police Preferred Specification”.

  • High quality and durable construction
  • Comes in a twin pack
  • Black, grey or pink designs
  • Police Preferred specification
  • Much larger in size than other Faraday bags, which makes getting keys from the bottom more of a task

Overall, the Defender car key signal blocker is an affordable yet high quality faraday pouch that won’t disappoint. It also features a “Police Preferred” design that’s tried and tested for complete peace of mind.

3. Best Faraday Pot: Blockr Keyless Car Key Signal Blocker

Another popular design is the convenient and extra secure alloy metal pot by the Blockr brand. It’s suitable for storing one or two key fobs and comes with a lifetime warranty for complete peace of mind.

To increase the protection against relay crime, it features three different types of protection. This includes the standard faraday lining, a scanner resistant alloy construction and a seamless secure lid to prevent signal leakage.

  • Triple keyless fob protection
  • Scanner resistant alloy construction
  • Full support and warranty
  • Stylish brushed metallic finish
  • Relatively expensive when compared to Faraday bags

Overall, the Blockr Signal Blocker Pot is one of the most secure options within the article but also the most expensive. However, it does come with an impressive warranty and is ideal for key fobs with multiple key rings attached.

4. Best Faraday Box: Todoxi Car Key Signal Blocker Box

Rather than having multiple Faraday pouches, a car key signal blocker box is a better option for storing multiple keys. The Todoxi Faraday Box is a great option that can hold up to 7 sets of keys, which makes it a far more cost-effective solution when compared to using multiple pouches. In terms of the construction, it’s covered in anti-friction leather with a high-density Faraday internal fabric.

  • Blocks 100% of all signals
  • Holds up to 7 key fobs
  • Provides more than 3 years of service
  • Stylish design
  • May be too small if you have a big bunch of car keys

If there are multiple cars in your household, choosing a Faraday box that can hold multiple keys is the best option. The Todoxi is a high-quality yet affordable option that offers more than 3 years of service life and a stylish design.

5. Best Large Faraday Box: OCOOPA Faraday Key Signal Blocker Box

Another stylish Faraday box is by the OCOOPA brand and they offer it in either a black or brown design. It’s one of the largest within this article and it can also be used to store other valuables such as watches, credit cards and much more.

  • Blocks car key and mobile phone signals
  • High quality imported wood material
  • Insulating cloth lining
  • Premium leather styling that's available in either black or brown
  • Double locks to secure the car keys in the box
  • The most expensive car key signal blocker within this article

Although more expensive than the Todoxi alternative above, it’s larger and has an additional lock for peace of mind. It also has a brown design, which may be desirable for those wanting to match it with the décor of their home.

6. Best Key Ring: MONOJOY Faraday Key Ring for Car Keys

Another car key signal blocker by the popular MONOJOY brand is their key ring box alternative. It’s designed to be compatible with 99% of key fobs and is available in carbon fibre, blue or solid black design.

  • Blocks all signals and protects the key fob
  • Available in three styles
  • Premium RF shielding material
  • Durable hook design
  • Double the price of a similar sized Faraday pouch

Overall, it’s a compact and convenient method of storing your key fob and it can also be taken with you wherever you go. The only main drawback is that it does come with a premium price tag when compared to the standard Faraday pouch.

How We Tested & Rated

Over the last few years, many brands have started to release various Faraday bags and other car key signal blockers. However, regardless of the type of blocker you choose, they all carry out the same job of restricting any signals passing the bag, box, pot or pouch. To help you choose the best, we have carried out plenty of testing and research and also considered several factors.

As shown in the photo, faraday bags are designed to be larger than the key but some alternatives come in the form of a box or pot that can be used for multiple keys.

faraday bag for car keys

In terms of our testing, we tested various car key signal blockers that included pouches, pots, boxes and keyring pouches (as shown in the images below). With regards to the Faraday pouches, we also used a range of different keys during our testing to ensure they fitted inside because this can be a problem with certain keys.

best faraday pouch
best key fob signal blocker

To keep up our commitment to reviewing and testing the latest car key signal blockers (for this article), we are continually testing out the latest options from top brands in the UK. This means that when we notice that a brand has released a new and improved car key signal blocker, we will attempt to buy it to put it to the test.

Below is a video that we posted on our YouTube channel that shows us testing one of our recommendations.

As you can see from the video, the key can’t transmit a signal outside of the Faraday bag for unlocking the door. It’s really that simple and it’s the reason why they are very popular for protecting your car against keyless entry theft.

Along with our extensive knowledge, testing and the latest research, we also considered several factors whilst rating the car key signal blockers. Some of these factors included their size, ease of putting your key into the bag or box, design, warranty and value for money.


Unfortunately, car theft and in particular, relay crime isn’t going to go away anytime soon.

Therefore, investing in a car key signal blocker for all your key fobs is highly recommended. You can even purchase an old-fashioned steering wheel lock for additional security.

All of our recommendations are suited to a range of budgets and include all the different types of signal blockers on the market. Regardless of the car key signal blocker you buy, it’s best to be safe than sorry.

If you require further information with regards to our car key signal blocker recommendations, feel free to get in touch and we will try to provide our assistance where possible.

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