Wireless range: 10 m 1Wireless range may vary due to environmental and computing conditions. Keyboard Spill-resistant design 2Tested 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 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. 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 4Keyboard 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