G-Cord&Acirc; 18 Keys Wireless USB Numeric Keypad for iMac, MacBook, Laptop/Notebook, Desktop/PC Computer Compatible with Windows and OS X System SIMPLE SETUP: Its easy to get startedyou just plug the receiver into a USB port and start crunching numbers right away. Keys are easy and silent to press, greatly speed up your productivity! Rubber anti-slip pad at the bottom,Stays in place - won't slip or slide SOLID, PORTABLE DESIGN:easy to take with you, so you can work confidently and quicklywherever and whenever.Professional 18 full-size and concave keys design, wireless 10 keys, applicated in sock, notebook computer, banking, etc. The keycaps life of more than 10 million times ADVANCED 2.4 GHz WIRELESS:Plug and Play, no device drivers, signal transmission stability, almost no delay, the maximum working range up to 33 ft HIGH COMPATIBILITY: Works with PC and desktop computers that have Windows XP, Vista, ME, 7, 8 2000 operating systems. Numeric keypad is not fully compatible with Mac system. (Function keys do not work, while number keys part works fine.) POWER SAVING:Power Supply by 1* AAA Battery (not include), It enters into hibernation/sleep mode automatically, energy saving, extended battery life, no power button needed of numeric keypad for laptop