Features: 1.2.4G Wireless: 19 keys portable keypad effective distance of 32.8ft, using 2.4G 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. specification:Item Type: Numeric Keypad with Screen Material: ABS Color: Black Battery Type: Built in 250mAh Lithium Ion Battery (Included) Connection Mode: 2.4G Wireless Effective Distance: Approx. 10meter / 32.8ft Number of Keys: 19 Keys PackageList: 1 x Keyboard (Ship with Inbuilt Battery) 1 x Data Cable 1 x Receiver 1 x User Manual