. Works with any desktop or notebook PC using USB 2.0 and XP, Vista or Windows 7 . Ergonomic and easy to use . Resize to change magnification . Crisp, vivid, full colour image . High contrast negative image (pure white text on black background) . High contrast positive image (pure black text on white background) . Screen grab function saves image to JPEG . Plugs directly into any USB 2.0 port . 5 feet of easy store cable . Simple, full function utility software included . Microfibre MouseBag included . Durable, CE approved, built to last