Ergo-Flex Keyboard USB BLACK Key Layout: 105 keys, with standard 101 QWERTY layout and special function keys- Macintosh and other config, Weight: Three keyboard sections with base plate; 4lb even (1.8kg)and activated Special Keyboard Functions Sections can be positioned close together or further apart - adjusts to each person's shoulder width Numeric keypad can be positioned on the left or in the middle an instant productivity gain for lefties!