Comcast adds motion sensing to millions of its newer routers, with a privacy catch

Comcast has rolled out a new motion-sensing technology to its latest home routers, allowing homeowners to receive notifications about activity detected inside their house while they are away. The free feature, called Wi-Fi Motion , turns newer Xfinity gateways into motion sensors by detecting interruptions to the Wi-Fi signal of the wireless network and sends a notification through the Xfinity app.