Mouse Included: No Normal Keys: 19 Operating System Supported: Windows 2000/ XP/ Vista Features: 3-in-1 design: use as a fully functional calculator or a 19-key pad for data entry or a USB hub. Integrated USB hub has 2 USB ports for your extra work accessories. Quickly switch between keypad and calculator with a simple press of the mode button. Clear LCD display works in various lighting conditions. No software needed, just plug it in to use. Parts: 1 year limited Labor: 1 year limited