Product Description for Purchase Relay attacks use a special receiver to intercept the constantly weak radio waves emitted by a smart key. This receiver acts as a relay point, sending radio waves to the car. The car mistakenly believes it's receiving a signal from the smart key, unlocks, and starts the engine. 【Relay Attack Prevention】 Simply placing your smart key inside this radio wave blocking case completely blocks the key's radio waves. This effectively prevents car theft via smart key radio wave relay. It's the best countermeasure against relay attacks. 【Radio Wave Blocking Key Case】 The double-layered radio wave blocking fabric enhances the radio wave blocking effect and product durability. It immediately interrupts radio waves from the smart key. 【Easy Car Theft Prevention】 This pouch is designed as a case, holds one smart key, and is easy to insert and remove, making it convenient to carry. It is compatible with various models from Toyota, Honda, Nissan, Mazda, Suzuki, Subaru, etc., but please note that it cannot accommodate the key for the new 40 series Alphard. 【Excellent Design】 Made with abrasion-resistant, high-quality PU leather and a copper zipper, with an elegant appearance and color design, it's suitable as a gift or for your own car security. 【Internal dimensions: 8x4.2x2cm】 Although I haven't used it after purchase, I have removed the packaging. There is another one with some scratches and a missing piece of hardware (photos ⑦⑧⑨). How about a set of two?