Linux also runs on embedded systems, which are devices whose operating system is typically built into the firmware and is highly tailored to the system; this includes mobile phones (especially smartphones), tablet computers, network routers, facility automation controls, televisions, digital video recorders, video game consoles and smartwatches. In fact, the Android operating system, a mobile operating system built on top of the Linux kernel, has the largest installed base of all general-purpose operating systems. In March 2017, it was reported that there were more users on Android than on Microsoft Windows, which is not based on Linux.