The difference between 1.x versions is unknown. The difference between 2.0 and "2.01(ES)" is believed to be the addition of wireless functionality, as an official [[Revolution SDK]] document describing compatibility for various [[Wii Remote]] models states that wired controllers are intended for the 2.0 and wireless controllers are intended for the 2.01.<ref>https://pokeacer.xyz/wii/pdf/RVL-ControllerHardwareOverview.pdf</ref> | The difference between 1.x versions is unknown. The difference between 2.0 and "2.01(ES)" is believed to be the addition of wireless functionality, as an official [[Revolution SDK]] document describing compatibility for various [[Wii Remote]] models states that wired controllers are intended for the 2.0 and wireless controllers are intended for the 2.01.<ref>https://pokeacer.xyz/wii/pdf/RVL-ControllerHardwareOverview.pdf</ref> |