The Wii MotionPlus is a Wii Remote enhancing device that increases the sensitivity of the Wii Remote so that MotionPlus compatible games feel more realistic. This device comes bundled with Wii Sports Resort and is required to play the game.
This accessory features an accelerometer that enables actions to be replicated identically in real-time.
There are Wii Remotes already built-in with Wii MotionPlus so that it can maintain the same gripping feel as a standard Wii Remote. This is called the Wii Remote Plus, and players can tell the difference between the regular Wii Remote and the Wii Remote Plus by the words "Wii MotionPlus INSIDE".