2x Car Key Signal Blocker Case Faraday Cage Fob Pouch Keyless RFID Blocking Bag

Features "secured by design" UK police preferred specification. The vehicle recognizes the fob when it's in range and unlocks the doors. Criminals can exploit this via a wireless relay attack. Using a radio frequency relay booster, it's possible to pick up and then transmit a key fob signal to trick the car into thinking a fob is present.

eBay