PHILADELPHIA – Comcast is adding an opt-in feature that can use compatible Xfinity home gateways and connected devices to detect motion, turning equipment already in millions of homes into a basic activity-monitoring system without requiring a camera.
The feature, called WiFi Motion, is part of the new Xfinity Shield service and is being enabled through an update to the Xfinity app. It works by measuring changes in Wi-Fi signals traveling between a gateway and devices connected around a home. Movement can disrupt those signals in ways that software can recognize, allowing the system to send an activity notification.
Yahoo Tech reported Aug. 19 that the free feature is available on advanced Xfinity gateways, beginning with the XB7 generation and newer equipment. Customers must choose to set it up, and controls in the app allow it to be turned on or off. The app includes Home Watch, Away Watch and Dark Watch modes intended to match different household routines.
Comcast says WiFi Motion is not a professionally monitored home-security service and does not replace cameras, door sensors or a traditional alarm system. Its effectiveness can vary with the location of the gateway, the number and placement of connected devices, the size and layout of a home, building materials and the strength of the Wi-Fi signal. The company advises users to test whether the feature detects motion in the areas they want to monitor.
The technology relies on radio-frequency changes rather than images or microphones, so it does not show who moved or record video of a room. That can make it attractive for people who want a basic awareness tool without an indoor camera. Possible uses include checking for activity while a resident is away or monitoring broad movement patterns in a household.
The rollout also creates privacy questions because it gives an internet provider another category of information about activity inside a home. Xfinity says Comcast does not actively monitor the motion events or notifications generated by the service. The feature is covered by the company’s residential service agreement and privacy policy, and customers are responsible for complying with laws that may apply to their use of motion monitoring.
A paid tier, Xfinity Shield Select, costs $15 a month and adds an indoor camera, a door-and-window sensor, cloud video storage and an urgent-response service. The free Shield package also includes network security tools designed to flag malware and phishing threats and includes expanded parental controls.
Wi-Fi sensing has been tested by router and smart-home companies for years, but accuracy, differences among home layouts and false alerts have limited adoption. Comcast says it spent three years refining its algorithms before the wider rollout. Customers considering the feature should review the settings, test performance and decide whether its convenience fits their privacy expectations.
Source: Yahoo Tech, published Aug. 19, 2026. Additional verification: Xfinity support documentation.
