Comcast is giving its Xfinity xFi customers more control over their home Wi-Fi network and those who access it with convenient, real-time push notifications. The notifications are sent to your smartphone, tablet and/or TV screen to let you know when a new device joins your network (i.e. xFi Advanced Gateway or another compatible xFi Wireless

Source: Hot Hardware – Comcast Rolls Out Xfinity xFi Real-Time Notifications For Home Network Management