Wireless Range 393.7 in (10m) 6Wireless range may vary due to environmental and computing conditions. Mouse Sensor technology: Smooth Optical tracking Number of buttons: 3 (Left/Right-click, Middle click) Scrolling: line-by-line Scroll Wheel: Yes, 2D, optical Connect/Power: On/Off power button 1 AA battery（Alkaline Battery) Battery life: 12 months 9Keyboard 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. Keyboard Spill-resistant design 7Tested under limited conditions (maximum of 60 ml liquid spillage). Do not immerse the keyboard in liquid. Adjustable keyboard height 10-Key Number pad Key type: deep profile Caps lock indicator light On/Off power switch 2 AAA batteries（Alkaline Battery） Battery life: 36 months 8Keyboard 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. Package Contents Keyboard with 2 AAA batteries Mouse with 1 AA battery USB receiver User documentation