Samurai Japan Smart Key Case: Relay attack prevention
Ever worry that a thief could clone your car key's signal from across the street? That's the reality of relay attacks, a modern-day car theft trick. The Smart Key Case tackles this head-on. It's a sleek, no-fuss shield that blocks radio waves, keeping your key's signal locked down tight. Designed specifically for L-sized smart keys, it fits a broad swath of today's vehicles without a hitch. Slip your key inside, and boom—instant protection. It's perfect for dodgy parking lots or city living, where these hacks are rampant. Built from tough materials, it shrugs off daily abuse while giving you that extra layer of security. Pro tip: make it a habit to stash your key in this case whenever it's not in use. Because why make it easy for the bad guys?
- Radio wave blocking
- L size compatibility
- Durable construction
- Easy to use
- Relay attack prevention
General specs
- Brand: Samurai Japan
- Seller: Joom
- Size: L
- Compatibility: Smart keys
- Function: Radio wave blocking, Relay attack prevention
- Material: Unspecified durable material
- First listed by seller: 8/24/25
If you are interested in more details, you can find full information on the seller's page.
View on seller's site
#publicidad
$61.12
Last price update: 8/24/25
Out of stock
Shipping options
Delivery to 
United States
United States
Unavailable
Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Smart Key Case Relay attack prevention
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Samurai Japan Relay Attack Prevention Key Case Radio wave blocking technology
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Smart Key Case for Relay Attack Prevention Blocks radio waves for security
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Car Key Signal Blocker Blocks radio wave relay attacks
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BrightonNET BC-RRATKEY-CB Blocks radio signals to prevent relay attacks
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Samurai Japan Smart Key 0.3 second storage access
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| Brand | Samurai Japan | Samurai Japan | LIBO | SAMURAI STYLE | BrightonNET | Samurai Japan |
| Model | Relay Attack Prevention Key Case | BC-RRATKEY-CB | Smart Key | |||
| Color | ||||||
| Rating |
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| Price | $61.12 | $31.48 | $58.84 | $67.00 | $47.91 | $83.83 |
| Seller | Joom | Joom | Joom | Joom | Joom | Joom |
| Update | August 22, 2025 | August 22, 2025 | August 23, 2025 | August 31, 2025 | August 27, 2025 | August 22, 2025 |
| Compatibility | Smart keys | Smart keys, Keyless entry systems | Most key fobs | Works with most key fobs | Smart keys, Key cards | |
| Function | Radio wave blocking, Relay attack prevention | Radio wave blocking, Relay attack prevention | Radio wave blocking | Radio wave blocking, Prevents relay attacks | Radio signal blocking, Relay attack prevention | |
| Material | Unspecified durable material | Faraday cage material | 3D carbon fiber | |||
Smart Key Case
$61.12
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Neha G.
Ahmedabad
September 4, 2025
first impression was great it arrived quickly and i started using it right away as someone who researches things thoroughly before buying this was a no brainer it blocks those radio waves effectively and i feel much more secure now especially in the city where thefts can happen i keep it with me all the time and it's become a habit to use it bottom line it works incredibly well and i'd recommend it to anyone with a smart key
- Pros: i was incredibly impressed with how this case keeps my car key safe from unwanted signals it fits perfectly and feels sturdy in hand the design is sleek and easy to use just slip the key in and it's protected right away perfect for when i'm in busy areas or leaving my car unattended
- Cons: none really it does exactly what it says without any fuss