Microsoft Wireless Comfort Desktop 5000 Designed for Comfort - Type more comfortably with low-profile Quiet Touch keys Ergonomist-approved Comfort Curve design - Microsoft's Comfort Curve encourages natural wrist posture and is easy to use. Microsoft BlueTrack Technology - World's most advanced tracking - go more places than optical and laser. Reliable wireless with snap-in transceiver - The 2.4 GHz wireless USB Mini-Transceiver Windows 7 Taskbar Favorites - Easily access programs in the taskbar with convenient hot keys. Please refer the Product Guide before use.