The Ironstripe Car Key Signal Blocker is an extra-large Faraday box designed to prevent car theft by blocking signal transmission from the key. With a spacious case size of 5.5 x 4.33 x 2.9 inches, this product is large enough to accommodate most standard car keys. The black-coloured box is not only practical but also stylish, providing a secure storage solution for your car key. Manufactured by Ironstripe, this device is a reliable and effective accessory to enhance the security of your vehicle.