[Logitech Wireless device user only]Get a free USB extension cable from logitech.com The extension cable enables you to move your receiver closer to your keyboard and/or mouse. This can help extend the range of your product and minimize problems from external Radio Frequency (RF) interference You have to enter various details with Model Number (M/N)*: Product Part Number (P/N)*: Product I http://www.logitech.com/en-us/utilities/forms/6227