Comcast gives its Wi-Fi motion detector a security makeover

Comcast has folded its Wi-Fi-based intruder detection feature into Xfinity Shield, a repackaged bundle of physical and cybersecurity offerings.

The US telco launched WiFi Motion in 2025.

Xfinity Shield also includes cybersecurity protections built into the Xfinity Gateway router.

The Wi-Fi sensing technology harnesses the radio waves beamed around a user's home to detect motion and potential intruders.

"Using Xfinity Gateway intelligence, WiFi Motion detects changes in the home's radio frequency signal between the Xfinity Gateway and a Wi-Fi connected device, then sends instant notifications to customers through the Xfinity app when unexpected activity is detected," Comcast said.

"It provides an added layer of awareness without recording video, capturing images or identifying individuals." The company does not consider this a home security service, merely a feature, because it is not managed by a dedicated security provider.

Not every connected device can support the sensing feature.

It uses the Xfinity Gateway, Xfinity Wi-Fi extenders, and up to three other compatible devices around the home.

Crucially, these devices must be stationary.

Think thermostats and home speakers, not smartphones or toothbrushes.

Comcast advises users to position the router and extenders so that their signals pass through the areas where they want to detect motion.

Open spaces such as hallways work best, and the company urges routine testing to ensure coverage is maintained.

A setting in the Xfinity app allows WiFi Motion to ignore small pets.

Animals weighing around 18 kg (40 pounds) or less will not trigger alerts when this setting is enabled, and the app warns this may also exclude small children.