Function: Blocking car key fob signal out from the faraday bags prevents thieves from picking up and relaying signals from your key. Get your car protected.Material: Carbon Fiber shell and metal zipper and hook, great touch feeling. Will never hurt your pants or belt, we believe you will love it.New Design: Make the faraday box and bags became one, protecting your key fob and car well enough. Not only holder your fob also blocking the signal.Maintenance Method: Clean water or a small amount of detergent, not dry cleaning, insolation, ironing, bleaching.Note: Please make sure the inside case is well closed to prevent signal leak and keep the inside signal shielding fabric dry.Specifications:Type: Faraday BagMaterial: Carbon FiberColor: BlackSize(L*W*H): About 9.5x5.5x4cm/3.74x2.17x1.57inchPackage included:1pc x Faraday Bag