Microsoft Surface is a series of tablets designed and marketed by Microsoft. It was announced by Microsoft CEO Steve Ballmer at a Los Angeles event on June 18, 2012, at Milk Studios. The Surface was initially available in two versions, one with Windows RT and another with Windows 8 Pro. The Windows RT model uses an ARM CPU, while the Windows 8 model uses an Intel CPU. Both models are able to install new applications via the Windows Store; however, only the Windows 8 Pro model allows the installation of traditional desktop programs.