LogiTech Wave design with Constant Curve layout guides the hands into just the right position, and rest comfortably,
Ease and natural rest: Cushioned palm rest makes work easier and more fun
Longer battery time: This feature gives you up to three years of battery life. (Battery life based on a calculation of an estimated 2 million keystrokes per year in an office environment. User experience may vary.)
Logitech Unifying receiver: The tiny Unifying receiver stays in your notebook, so there's no need to unplug it when you move around. And you can easily add compatible wireless mice and keyboards to the same wireless receiver

Features:

• Mfr Part Number: 920-001996
• Wave-shaped key frame
• Three-year keyboard battery life
• Logitech Unifying receiver
• Advanced 2.4 GHz wireless
• Constant curve
• Cushioned, contoured palm rest
• Adjustable keyboard height
• Instant media access
• Programmable keys
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• System Requirements:
• Windows XP, Windows Vista, or Windows 7
• USB Port
• Internet connection or CD-ROM drive
• Package Contents:
• Keyboard
• Logitech Unifying receiver
• Logitech software CD
• 2 AA batteries (pre-installed)
• Receiver extender cable
• User documentation
• 5-year limited hardware warranty