Features: Put this thin and compact keyboard in your laptop bag or briefcase and enter data efficiently wherever you go. Simply plug this keyboard into an available USB port to use. There is no need to download drivers or other software to use this keyboard. Add numeric keypad to existing keyboard, add three USB 2.0 ports to PC/Laptop for fast and comfortable data entry. Easy to set up, plug and for play, hot swappable. Ultra-thin and compact; no driver required. Compatible: for 10.4 and above; for Windows XP, Vista, 7, 8, 10. Specifications: Type: Numeric Keypad Number of keys: 18 (keys) Interface: USB 2.0 Product Size: approx. 13.6x9.3x2cm/5.35x3.78x0.79in Note: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Please allow slight error due to manual measurement. Please leaving a message before you give the bad feedback, if the products have some problems. Package includes: 1 x Numeric Keypad