The SignalVault uses electric-field technology that makes your information inaccessible to hackers. The SignalVault utilizes Dual-Stage Protection, which not only blocks but actively jams hackers. It protects all chipped credit cards and debit cards for three years and provides laboratory-tested protection without charging or batteries. Featured on popular TV shows like “Shark Tank" and “Good Morning America," the SignalVault is continuously tested and updated to defend against new hacking technology. One SignalVault protects as many as four credit cards.