This RFID-blocking key-fob case works like a faraday cage to protect your car from theft

Designed to protect your key-fob from physical damage as well as digital theft, the KeyBlock is an RFID-blocking case that you can store the fob and keys in. The fob sits inside a compact, specialized hard-case enclosure, while the keys hang from it. Practically the size of your key-fob itself, you can carry the KeyBlock around with you. The RFID-blocking housing prevents spoofers and hackers from replicating the signature key-code your fob generates, and therefore denies them access to your car. When you DO need to use the fob, just open the box and slide it out using a slider built right into the KeyBlock’s side. An internal spring mechanism keeps your fob in place, preventing it from sliding out if held upside-down, and a small leash holds your keys too, letting you open your car the old-fashioned way, should you choose.