With 10.25" x 4.4" x 1" dimensions, the GKM681R can be easily stashed away when you do not need it. This keyboard's built-in optical trackball helps to make command input easy. You can work and play up to thirty-three feet away from your Home Theater PC, Media Server, computer or laptop. This same range also applies to game consoles. You can organize your media collection on your connected TV with the GKM681R. There are sixteen hotkeys on this keyboard that allow you quick access to your favorite applications. For set up, you need only plug the included USB RF receiver into your computer's USB port. This model differs from the higher cost GKM611B model in that the GKM611B is geared toward Bluetooth use (and has the ability to connect with six separate Bluetooth devices up to thirty feet away). The Iogear GKM681R works at a speed of 2.4GHz.