It’s a terrifying scenario: You awake in the middle of the night to discover armed robbers breaking into your home, demanding the codes to your store’s front door and safe. Home invasion robberies are a jeweler’s worst nightmare. The goal in these cases isn’t to rob your homes, but to clean out your store. “They find out where you live, and they wait for the right moment,” says John J. Kennedy, president of the Jewelers’ Security Alliance in New York City. “Their goal is to take you or your keys to the store.” Thanks in part to technological advances in home security, the number of home invasion robberies—and kidnappings—of jewelers has dropped in the past five years. But they still happen: A Riverside, Calif., jeweler was the victim of a robbery in his home in August. We asked Kennedy to share his top five tech tips for preventing thieves from breaking into yo