Sirius Stiletto was a brand of satellite radio portable media players from Sirius Satellite Radio. The original model, the Stiletto 100, was launched in October 2006. (A predecessor, the Sirius S50, was portable but was unable to receive satellite signal unless docked.) The successor to the Stiletto 100, the Stiletto 2, was launched in November 2007. These devices run Linux and the end-user software in these devices is powered by the Mono Framework a portable .NET implementation for many platforms, including embedded Linux systems such as the Stiletto.