Prevent Your Car From Being Stolen! This Item Provides a Complete Signal Blocker for Your Vehicle Keyring Fob. This Prevents Thieves From Picking Up & Relaying Signals From Your Key, & Shields Against Break-Ins & Keyless Ignition Theft.Made of Special Dual Weave Signal Blocking Nano Materials Inside & Shielded Layer Design. with Keyring Chain. Minimum Quantities Apply.