Your Smart Home Can Hear What You Can't

Your smart home may contain signals you cannot hear. Near-ultrasound beacons, microphone permissions, cross-device tracking, and newer Wi-Fi sensing research all point to the same privacy question: what happens when ordinary devices can infer presence and movement from the room itself? This video explains ultrasonic cross-device tracking, the acoustic handshake between screens and phones, how multiple devices can become a rough location map, why Wi-Fi sensing belongs in the same privacy conversation, and what you can do to audit microphone access, check for high-frequency spikes, and choose devices with clearer controls. The goal is not panic. It is an honest home: visible sensing, narrow permissions, local processing where possible, and practical controls that make hidden signals less hidden.