Kind Notice for compability - Widely Compatible with Cellphone Tablet PC laptop Desktop with Android Windows 2000/ Me/ 98/ XP /Vista/ 7/ 8/10 system. NOTE: [This number pad is NOT completely compatible with Macbook OS system and Apple iOS system, Calculator Key and Functional Keys(home, end, Pgup, PgDn and arrows) can not work but other number and symbol keys including ESC, Tab work well. Not support AZERTY Keyboard Layout! Before purchasing the keyboard, Please check your keyboard layout on Windows. Tips for Bluetooth Verison : 1. It needs take 10~15 seconds to make the bluetooth connection stable. Please always use the bluetooth keyboard 10~15 seconds after creating bluetooth connection. Otherwise, you will sometimes see the repeat input. 2. The Numeric Keyboard use AAA battery for power supply. it doesnt support USB connection. 3. Bluetooth version requires your Laptop/PC supports has bluetooth function. Or you have a external Bluetooth Dongle. Otherwise Please purchase 2.4G verison. Kind Reminding: Before you place order, you must know the difference between 2.4G Version and Bluetooth verison.We carefully explain the user scenario for 2.4G verison and bluetooth version on the details pages. For Bluetooth version keyboard. you wont find a wirle receiver/Dongle in the box since the receiver/Dongle is unneceary for bluetooth verison.