Comcast’s Xfinity is increasingly touting its WiFi routers as home security devices, and more people than ever can choose to give their ISP a better peek into their living room.
The company announced this week that it is rolling out Xfinity Shield, a cyber and home protection platform available to millions of customers nationwide at no extra cost. The service bundles cybersecurity and parental controls with WiFi Motion, a feature that can turn existing WiFi equipment into motion detectors.
“An opt-in feature, WiFi Motion uses the WiFi signal from a customer’s Xfinity Gateway to sense movement in their home — no cameras needed or recordings captured,” the company wrote in a press release.
Comcast says that WiFi Motion works by detecting changes in the radio frequency signals traveling between routers and WiFi-connected devices.
While Comcast started offering WiFi Motion back in 2025, the company is now expanding and promoting the feature as part of its broader Xfinity Shield platform.
“We believe the network should do more than connect devices. It should help protect the people, their personal information, and everything within their homes that depend on our most reliable WiFi every day,” said Comcast Chief Growth Officer of Connectivity & Platforms John Gieselman.
The feature sends push notifications to users when motion is detected near a connected device, such as a TV or printer. It has different settings for when people are home, asleep, or away. The Xfinity app also lets users see live motion activity and a feed of recent activity.
Comcast acknowledges that the system has some limitations. Home size, layout, building materials, and the placement of the router and connected devices can all affect its ability to detect motion. Comcast says it does not guarantee its performance.
Still, some people have already gone online to raise concerns about how creepy the technology feels and whether it could be used to spy on or surveil people inside their homes.
The news comes as researchers in Germany showed earlier this year that WiFi signals could be used for far more than detecting motion. For instance, researchers were able to use beamforming data and AI to identify people with 99.5% accuracy. At the time, the researchers warned that the technology could turn ordinary routers into surveillance tools.
But the biggest privacy concern comes directly from Comcast’s own support page, which says information generated by WiFi Motion may be shared with third parties.
“Comcast may disclose information generated by your WiFi Motion to third parties without further notice to you in connection with any law enforcement investigation or proceeding, any dispute to which Comcast is a party, or pursuant to a court order or subpoena,” the page reads.
Comcast did not immediately respond to a request for comment.
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