USB 19 keys Numeric/Number Keypad keyboard for Laptop Notebook USB 19 keys mini numberic keypad adding "BackSpace", "Enter", "000" three keys compare to the normal desktop numeric keyboard area. Plug-and-play, quiet noise and made of superior material, good tactile feedback and human body engineering design. Can be applicated in accounting, banking, stock, KARAOKE, medical etc, special designed for laptop, but it also works with desktop. 100% compatibles MS DOS Windows 32, Windows 95, Windows98, Windows Me, Windows 2000, Windows XP, Vista, Win7. NOTE: Win32, Win95, WinNT are not support USB device. Operation voltage: 5V, Operation current: Less than 50mA, Dimension: approx. 5.1" x 3.5" x 0.8" (130 x 90 x 10 mm),USB cable length: 4.95 feet (1.5 m), Weight: approx. 3.03 oz (86 g).12-month free replacement warranty for manufacturer defect.