Check the listing for details. Faraday Bag for Car Key FOB Signal Blocking Fits in Lockboxes Purse Size 4"x2.5". Color: Black, Condition: New. Listed at 11.49 USD. Signal Blocking Faraday Bag for Key FOB Protects hacking into or access to the signal for key Fob's. The bag forms a 'Faraday cage' that block the key Fob signals from escaping the pack. Great for use with key storage lock boxes to safely and conveniently secure keys. Features:Once sealed inside, your key fob is protected from criminal signal boosting devicesHighly durableIdeal for safe keeping in the house, lock box, purse, pocket, or travelingA loop is provided on the backside so it can connect to the inside of a purse, lock box etc.Bag closes easily with with elastic bandDimensions - 4"tall x 2 1/2" wideLIsting is for 1 Faraday Bag. Key FOB in pictures are not included.Blocking Pouch for car key FOB, Anti-Theft Keyless entry car key protector Faraday bags are increasingly being used by car and boat owners to isolate duplicate wireless keys and protect their vehicles form theft. Placing a wireless electronic key Fob in a select fabricators RF isolation pouch prevents the devise from sending radio frequency signals to the vehicle's electronic ignition and entry systems. Faraday bags are made of highly effective materials which form a protective 'Faraday cage' when sealed. Placing a wireless electronic key Fob in our Faraday Bag prevents the device from sending radio frequency signals to the vehicles' electronic ignition and entry systems. Opening and removing the car key fob from the pouch allows it to once again send and receive signals. The majority of modern cars use key-less entry technology, allowing for remote access to the vehicle and its ignition. The Faraday Bag is lined with special material preventing your key fob from communicating with your vehicle. This pouch creates a Faraday cage around anything that is sealed inside. The use of radio transmitters allows criminals to capture the signal from a car's key Fob. If the transmitters are within proximity, access to the vehicle can be gained and the engine can be started. The Faraday Bag for Car Keys is industry-leading protection for your mobile devices and key-less car fobs. Buy with confidence…we ship within 1 business day, with Free Shipping, and 30 day free returns. Thank you for viewing our listing. Please feel free to contact us if you have any questions or need additional pictures. Don’t forget to click on our “Stores” link next to our eBay name to see other items we currently have listed for sale (new items added often).