Automatic Signal Suppression: Protect yourself from electronic hacking and car theft, no more lost cars. Wide Compatibility: Our signal blocker has been tested and compatible with over 99% of all key fobs. Small Size: 13.5 x 8.5 cm, we provide two small pockets, the smallest key case can be put in your handbag or backpack for easy carrying. Upgraded Design: Equipped with a detachable key ring and a lanyard with carabiner, you can hang it on your pants, belt or handbag for easy carrying. Material: Nano-coated with unique carbon fiber texture, wear-resistant and anti-radiation to ensure long-term protection.