ANTI-THIEF: We often use the keyless to start the car. After parking, put the car key in the protective bag. The key signal was blocked, so we could leave the car safely without fear of using high-tech thieves to steal the car. PORTABLE: 14.5 x 9.7 cm / 5.7 x 3.82 inch our products are designed and tested on 99% of car makes and models to ensure maximum protection. MULTI-FUNCTION: The smaller/front pocket is anti-radiation, good for storing ID cards, bank cards, etc., about 2-3 cards. The larger/rear pocket is for signal blocking, ideal for storing car key fobs. CARBON FIBER MATERIAL: It is made of high quality carbon fiber textured material and two layers of protective materials packed in a gift box. It provides signal blocking function and luxurious and fashionable accessories. FARADAY BAG KEY FOB PROTECTOR: Prevent your car security system from being hacked. Protects your personal and financial data by preventing RFID scanners and readers from detecting your cards' RFID signals, effectively preventing remote access to your keyless entry key fobs.