External Number Pad - External number keypad with 19 keys for a laptop or a keyboard without an integrated number keypad area. For Comfort - Big and bold print on keys with a tilted design for maximum visibility and comfortable to use. Built-In USB Hub - Two built-in extra USB ports on each side offer you more flexibility for additional input devices, such as your mouse, keypad, or USB Flash Drive. Quiet Scissor Switches - Scissor key switches for premium laptop-typing feeling and quiet typing experience. Stable Wired Connection - Wired USB connection with easy to set up thanks to the Plug-and-play feature, no delay and interruptions for more productivity. System Requirements - Windows XP, 7, 8, 10 and above Dimensions - 5.16 x 3.43 x 0.79 inches Weight - 0.23 lb Cable - 2.6 ft.