This Faraday Key Fob Jacket is your best defense against modern car thieves who use signal boosting to steal vehicles! The triple-layer construction with specialized nickel and copper shielding fabric creates an impenetrable barrier that blocks all signals - we're talking key fob signals, Bluetooth, Wi-Fi, cell signals (including 5G), GPS, and RFID. The 85 dB attenuation rating from 400MHz to 4GHz means virtually no signals get in or out when your keys are inside. The water-resistant TPU exterior keeps everything dry, while the double-fold magnetic closure ensures a perfect seal every time. At 5.25x7.5 inches interior size, it accommodates any key fob, Tesla keycard, or RFID badges comfortably. It's not just for car keys either - use it for USB drives, SSDs, credit cards, or any small electronics you want to keep secure from digital snooping. The slim profile expands for bulkier keychains, and the durable construction holds up to daily use. If you own a modern keyless entry vehicle, this is essential protection against relay attacks where thieves amplify your key's signal to unlock and start your car. It's also perfect for rental car owners, Turo hosts, or anyone who wants peace of mind knowing their vehicle can't be stolen through electronic means. Seriously, if you have a keyless car, this inexpensive bag provides protection that's worth every penny!