The Kama Controller provides all the same abilities and features of the Nunchuk, but with a custom ergonomic design that provides less stress and strain during game play. The Kama Controller is compatible with all Wii software that utilizes the Nunchuk attachment and requires no additional software or modification of the Wii hardware to work, simply plug and play. The Kama Wired controller features specially designed buttons for added accuracy and comfort and a rubberized grip. The Kama is the only solution for users who want to take their Wii controllers to the next level of comfort and usability. Requires No additional batteries - powered by wii remote.