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Wireless Mouse The wireless mouse has replaced the roller ball mouse. It's primary benefit is not having to drag around the wire that connects it to your PC. Instead it communicates with Infrared light (IR) or radio waves (RF) to a fixed pod that is cable connected to a PS/2 or USB port on your PC. Just about all wireless mice use an optical beam focused down on the table surface to convert the mouse movements on the surface to the pointer movements shown on your display. Infrared Type The first wireless mouse used Infrared light to communicate with a fixed pod that cable connects to your PC usually through a USB port. IR is the same technology that is used in your TV remote controller, which can span a good distance between the controller and TV. The major drawback to IR is that anything directly in between the mouse and the pod blocks the IR signal and the mouse fails to work until the blocking object is removed. RF Type The RF uses radio Frequency signals to communicate between the mouse and the pod. Unlike IR it does not need direct line of sight to work properly. These devices cost about twice the amount of the IR type mouse. Wireless Keyboard They use the same IR or RF technology as the wireless mouse to communicate with a pod. You can often buy a wireless mouse and wireless keyboard set that communicates with a single fixed pod that cable connects to your PC. 
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