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Keyboard Spill-resistant design 1Tested under limited conditions (maximum of 60 ml liquid spillage). Do not immerse the keyboard in liquid. Adjustable height -tilt legs Special Keys: Music Controls Palm Rest 10-Key Number pad Key type: Deep profile On/Off power switch 2 AAA batteries（Alkaline Battery) Battery: 36 months 2Keyboard battery life calculation based on an estimated two million keystrokes/year in an office environment. User experience may vary. Mouse battery life may vary based on user and computing conditions. Mouse Sensor Technology: High-precision Optical tracking Number of Buttons: 3 (Left/Right-click, Middle click) Scrolling: line-by-line Scroll Wheel: Yes, 2D , mechanical Connect/Power: On/Off power button 1 AA battery（Alkaline Battery） Battery: 18 months 3Keyboard battery life calculation based on an estimated two million keystrokes/year in an office environment. User experience may vary. Mouse battery life may vary based on user and computing conditions.