About this item:CAR KEY SIGNAL BLOCKER: It is designed as a hand held size key protection bag only for a single key fob. It protects your car key from being stolen and also protects your car key against damages, dust and scratches.IMPROVE DESIGNThe interior design is like a small box. It is a combination of faraday bag and box, strongly blocks signals with high quality double layer carbon fiber material and thick shielding cloth which guarantee for signal isolation.100% block. It's designed to keep your keyless fob safe from thieves.PREMIUM QUALITY: Hook design for hanging,pu leather carbon fiber and smooth metal zipper design, your car get protected when you put your keys into this bag. Convenient and good sewn craftsmanship. Convenient use it every day.