[ MINI SIZE ] :14cm x 9cm, smaller than others,more convenient to carry in most pants pockets.[ IMPROVED HOOK&KEYCHAIN DESIGN ] : Upgraded snap hook on the back design, and the inside key ring ensure that taking the car key out easier.[ SECURE YOUR KEYLESS ENTER CAR ] - Simply place the car key fob into the faraday bag and your car is protected. it can prevent criminals from using technology to enter your vehicle or keyless remote entry system to protect your property.[ BLOCKS ALL TYPES OF SIGNALS ] - Like calls, SMS, WiFi, 5G, Bluetooth, RFID, NFC. Blocks and Unblocks in just 5 seconds Put your car key into faraday bag to prevent vehicle remote control theft criminals.[ HOW DO I KNOW ITS WORKED ]: With the key in faraday pouches alongside the car handle, try to open the door, the car door will be locked. Go inside the car, try to start the engine, the car stalled.