This is a mini USB numeric keypad， it has 19 keys. It supports plug and play and hot swappable. With solid and durable structure and power on indicator LED light. Compact and fits easily into your computer bag， briefcase， etcFeatures:- Mini digital keyboard with 19 keys- Compact and fits easily into your computer bag， briefcase， etc- Solid and durable structure- Plug and play and hot swappable- Power on indicator LED light- Supports USB port on any PC or laptopKeyboard Interface: USBSystem Requirement: 1 USBCompatibility: DesktopDesign Style: StandardOperating System: Windows ME / 2000 / XP / Vista / Windows 7Color: BlackProduct Dimensions(L x W x H): 132 x 102 x 15mmPackage Dimensions(L x W x H): 238 x 160 x 25mmProduct Weight: 94gPackage Weight: 99gPackage Include:1 x USB Numeric Keyboard