This is the only Cordless Desktop to feature the rechargeable MX Revolution hyper-fast scrolling laser mouse, and a dynamic keyboard display. An integrated LCD makes it easy to play music, use your calculator, receive incoming message notifications, and check the time and date Enables dependable, cordless connectivity from up to 30 feet Helps ensure a hassle-free setup Fits your hand for ultimate comfort and control Offers a more natural typing experience Comfortably supports your hands.