1、4G Wireless: 19 keys portable keypad effective distance of 38ft, using 4G wireless design, large coverage area, with screen. 2、Plug and Play: The Number pad requires no drivers and is plug and play, requiring only a USB port to provide you with the most stable USB connection. 3、U Shaped Keys: The keys have a U shaped design with a soft pressing touch, providing you with the most comfortable tilt angle to help reduce the pressure on your wrist. 4、Low Noise: The 19 key USB numeric keypad is the least noisy, making it the best choice for working with spreadsheets, accounting documents or financial applications. 5、Applications: USB wireless number pad is suitable for windows 98/95/NT/ME/2000/XP/Vista/7.0/8.0 and above operating systems of various laptops and desktop computers.