[HOOK DESIGN] The pouch features a zinc alloy hook on the top to hang on jeans or backpack, with an inner key securing chain for easy access to your vehicle key. [REMOTE KEYLESS ENTRY CAR PROTECTOR] This Faraday pouch for car keys is made of RFID shielding material that helps prevent unauthorized signal amplification, protecting your keyless entry fob from remote access. [MULTIFUNCTION SIGNAL BLOCKING CASE] This pouch blocks calls, SMS, Wi-Fi, 4G, Bluetooth, RFID, and NFC signals. [ONE SIZE] 9 x 14 cm; each signal blocking bag fits one car key. Two pouches are included to protect an additional key. [WIDELY USE] These RFID pouches block signals for any compatible device that fits inside. No need to consider model or brand. The pouch fully blocks car key fob signals to help prevent unauthorized access. How does the Faraday case work? Some devices can operate over long distances, allowing unauthorized individuals to intercept signals without detection. These key signal blocking pouches help prevent signal amplification attacks by shielding your key fob when not in use, helping protect your vehicle from theft. Keep key fobs and small electronics inside the Faraday bag when not in use to block unauthorized signal access.