User-friendly ergonomic tilt and space-saving design reduces hand fatigue Numeric keypad supports the NumLock function with an indicator light for improved efficiency Optimized 19-key design includes 000 key for speedy input and fast calculations Ergonomic Quiet Soft Touch design provides comfort during long applications Easy plug and play wired connection requires a USB port but does not require drivers for installation and use Compatible with PC and Desktop computers that have Windows 10, 8.1, 8, 7 or Mac OS 10.4 or higher operating system