The Grove - NunChuck is a small PCB that adapts the Wii Nunchuck connector to standard Grove connector. The power, ground and two-wire interface of the Nunchuck are all broken out to a 4-pin 0.1"pitch header. This ?Grove - NunChuck?, let you play with the Wii Nunchuck and other Wii remote peripherals without needing you to cut cables. Just plug it into the Wii Nunchuck, then into theGrove - Base Shield .