A baby monitor is a dual-component surveillance system designed to give parents peace of mind by providing a constant audio or video link to their infant’s sleeping environment. The setup typically consists of a transmitter equipped with a microphone—and often a high-definition camera—placed near the crib, which broadcasts real-time data to a portable parent unit or a smartphone app. Modern iterations frequently include advanced features such as infrared night vision, two-way talk back, room temperature sensors, and motion alerts, ensuring that caregivers can respond instantly to cries or movements from anywhere in the home.