What did Marie V Brittan Brown invent?

Marie V. Brittan Brown invented the first home security system in the 1960s. Her invention included a series of peepholes, a camera, and a monitor that allowed homeowners to see who was at their door before answering. She also developed a remote control that could unlock the door and alert the police, laying the groundwork for modern home security technology. Brown's innovative design was patented in 1969.