Description: Ultrathin Design: Ultrathin Design, fully equipped with 18 buttons, toss this thin and compact keypad in a laptop bag or briefcase to efficiently enter data wherever you go. Easy to Use: Simply plug this keypad into an available USB port and it's ready to use. No drivers or other downloads are required to use this keypad. 3 USB 2.0 ports: Adds a number pad with 3 USB 3.0 ports to your existing keyboard to your PC/ Laptop for quick and comfortable data entry. Easy to Use: plug and play, hot swappable. Compatibilitie: Compatibilitie for OSX 10.4 and above; for Windows XP, for Vista 7 8 10.   Specification: 18 Keys: "↑ ← ↓ →" , Home End Ins Del and PgDn buttons work for Windows XP, for Vista, for Windows7 8 10, however NOT for OS, The "Num " for Windows XP for Vista for Windows 7 8 10, however NOT for OS Size Chart: Material: Plastic Product size: 136mmx93mmx20mm Package Includes: 1Pc Wired USB Numeric Keypad Note: Please allow slightly errors due to manual measurement and different monitors.