Modern and sober design: iClick - Bluetooth wireless with 28 keys - simple and easy to use with your computer. With an aluminum finish and its SLIM design, take this numeric keypad everywhere with you. Bluetooth 3.0 technology: This wireless technology allows a stable wireless connection. The numeric keypad has a range of 10m max. Bluetooth is compatible with Mac OS, iOS, Windows, and Android, and works with iMac, MacBook Air, MacBook Pro, and any laptop with Windows 10/8/7. 28 keys: In addition to the traditional 17 buttons of a numeric keypad, it has 9 additional keys often most used with a standard keyboard. These keys (Home, End, Esc, Pgup, PgDn and arrows) only work with the Windows operating system. Built-in rechargeable battery: You dont need to change the batteries. It is easily recharged using the supplied USB cable. This numeric keypad works even while charging. 2 hours of charge = 2 weeks of use (autonomy calculated on average use).