Product Specifications: Key box to prevent relay attacks. A relay attack is a method that uses a radio amplifier to amplify weak radio waves coming from the smart key, unlocking the car door and starting the engine to steal the car. There is a layer of metal mesh inside the box to block the weak radio waves; this mesh acts as an electromagnetic signal blocker. Keep the box with the lid completely closed. If there is a gap, it cannot block radio waves. Design: Made of PU leather for excellent texture. Simple and stylish design with a black base allows you to place it anywhere. You can not only use it in your entryway or living room, but also in the office or when you are on the go. [Features] In recent years, thieves have increasingly used relay attacks targeting luxury cars. This product is made with a double-layered radio wave blocking material that prevents relay attacks and protects your valuable car. Please close the lid properly when in use. It cannot block radio waves. Size: 11.5 x 9 x 6.2 cm; It can not only be used to store keys, but can also be used for a variety of purposes.