1 Covers sold separately. 2 For Surface Pro 2, Microsoft Office is sold separately. Surface and Surface 2 come preloaded with Microsoft Office 2013 RT. Some features and programs unsupported. See http://office.com/officeRT for details. 3 Testing consisted of full battery discharge during video playback and Internet browsing. Video playback was tested with a repeated 95-minute movie downloaded from Xbox Video. All settings were default except: Wi Fi was associated with a network, Auto-Brightness disabled, and Bluetooth Radio was turned off. Battery life varies significantly with settings, usage, and other factors.