Precise Trackball Control Built-in 19mm trackball allows accurate cursor movement without moving the keyboard ideal for tight workspaces, medical, industrial, or media center use. Helps reduce wrist strain.; 78-Key Compact Layout + Scissor Switch Full-function keyboard in a space-saving design. Scissor switch key structure delivers quiet, comfortable typing with tactile feedback perfect for extended use.; Adjustable Backlight (Backlit Version Only) Backlit model supports 3-level brightness control: press hotkey once to turn on, twice/three times to increase brightness, fourth time to turn off great for low-light environments.; Wide System Compatibility Plug & Play Compatible with Windows 2000/XP/7/8/10/11, Mac OS, iOS, and Android. Connects via standard USB port no driver needed, just plug and use.; Enhanced Productivity Features Supports Fn key combinations for Scroll Lock and other extended functions. Also includes CPI switching for adjustable cursor speed adapts to your workflow.