Comcast has introduced a new feature in its Xfinity Shield platform that turns your router into a motion sensor. The company claims it only keeps track of activity for up to a week, but the privacy concerns remain. Customers can turn off WiFi Motion if they wish, or even replace the leased gateway with their own equipment.

One customer expressed reluctance about a device measuring family movements without consent, while another questioned whether Comcast could enable this feature remotely. The data collected is not visual; it only captures motion events and which Wi-Fi-connected device detected them, but it can still be subpoenaed by law enforcement.

The accuracy of the system is questionable, especially for smaller objects like pets under 40 pounds. While it does not capture images or video, the ability to track movement through walls makes it a potential tool for surveillance. Customers also fear that if WiFi Motion were enabled without their consent, they could be monitored without their knowledge.

Comcast insists on opt-in usage and that no real-time monitoring occurs. However, concerns persist regarding legal compulsion and the technical capabilities of the system to follow people through a home by detecting motion in connected devices.