The Treksafe RFID pouch offers superior protection against hacking and unauthorized access. Designed with cutting-edge technology and durable materials to ensure your car's security. It accommodates multiple sizes of keychains and small devices.The car key signal blocking pouch includes a zinc alloy hook and key chain. You can use the hook to hang the pouch on your pants or knapsack, the inside key ring ensures taking the car key out is easier. Placing your key into the closed faraday bag will prevent your car key signal from being accessible by thieves.