Microsoft PlaysForSure was a certification given by Microsoft to portable devices and content services that had been tested against several hundred compatibility and performance requirements. These requirements include codec support, digital rights management support, UI responsiveness, device performance, compatibility with Windows Media Player, synchronization performance, and so on. PlaysForSure certification was available for portable media players, network-attached digital media receivers, and media-enabled mobile phones. The PlaysForSure logo was applied to device packaging as well as to online music stores and online video stores.