[MINI SIZE] :11.5cm/4.5 x 7.2cm/2.83, smaller than other products, easier to carry in most trouser pockets. Each Faraday key bag is strictly tested before shipment, and it works 100% normally. [Improved hook and keychain design]: The upgraded spring hook design and the internal key ring make it easier to take out the car keys. [Protect your keyless entry into the car]-Just put the car keychain in the Faraday bag, and your car will be protected. It can prevent criminals from using technology to enter your vehicle or keyless remote entry system to protect your property. [Block all types of signals]: such as calls, text messages, WiFi, 5G, Bluetooth, RFID, NFC. Block and unblock in just 5 seconds Put your car keys into a Faraday bag to prevent criminals from remote vehicle theft. [How do I know it works]: Put the key in the Faraday bag next to the handle of the car, try to open the door, and the door will be locked. Enter the car, try to start the engine, the car stalls.