Fangrui Product Details Wireless Numeric Pad That Can Be Used By Plugging In The Computer: No Driver Required; Only 1 Aaa Battery And One Usb Port Is Required; Giving You The Most Stable Usb Link.(not Included Batteries) Soft Pressing Touch: Provide You With The Most Comfortable Angle Of Inclination And Hlp Reduce Pressure On Your Wrist. The 18 Key Usb Numeric Keypad Has Minimal Noise And Is The For Processing Spreadsheets, Accounting Documents, Or Financial Applications. High Key Accuracy Stable Rubber Sheet At The Bottom: The Key Name Is Clear, The Key Is Raised, And The Comfortable Pressing Feeling Improves Your Work Efficiency. The Stable Rubber Sheet At The Bottom Falls Off, And It Fixes Your Usb Number Pad. The Usb Wireless Numeric Keypad Works With A Variety Of Laptops And Desktops With 2000, Xp, Me, Vista Or 7/8 And Above. The Portable, Light Weight Design And The Classic Numeric Keypads Are For Business Trips Or Daily Use, Providing You With A More Comfortable And Convenient Experience. Size:3.93x