PROTECT YOUR CAR - Effectively blocks all signals in the bag, preventing criminals from using key fob stealing tools to access your vehicle. Just put the key into the closure to prevent your car key signal from being obtained by thieves, all signals can be 100% shielded (when the car key is put into the shielding bag, the zipper must be fully closed), protecting your car at any time. COMPACT SIZE - The car key bag measures 4.13*2.56*1.2 inches (10.5*6.5cm*3cm), small in size, easy to carry and can provide more flexibility. Please check your car keychain size before ordering. How do I know it works? - Can effectively block signals and prevent vehicle theft. You can test it yourself! Just put your car keys in the bag, close the bag and fully zip it up and you will notice that nothing happens to your car. HIGH QUALITY MATERIALS - The key box fob protective bag is made of high quality PU leather and two layers of shielding material, the handmade textured leather keychain is handcrafted with carefully woven stitching and a sturdy matte zipper closure/keychain loop to provide a complete signal Interceptor. It looks more elegant, luxurious and high-end. PORTABLE AND SECURE - Fits most car keychains and keyless entry, it's perfect for locking and unlocking doors or trunks when inside a purse/bag/pocket/waistband and prevents doors or trunks from being opened accidentally. This can be used as a gift for your family and friends.