eranton Portable 18 Keys Wireless Usb Numeric Keypad for Laptop Pc Computer Compatible with Windows Xp Vista 7 8.1 10 Portable mini size light weight with backspace key great for laptops Execellent build quality: nice keys feel,responsive,smooth flowing, rubber base make it non slip Built-in energy saving mode :If not used the keypad will go to energy saving mode automatically and will make your battery life much longer,just press any keys it'll return to work mode Plug and play :no driver installation is needed ,Compatible with chrome book ,windows xp vista 7 8.1 10 laptops