Every slight movement players make with their wrist or arm is rendered identically in real time on the screen, providing a true 1:1 response in their game play.

The device incorporates a dual-axis "tuning fork" angular rate sensor, which can determine rotational motion. The information captured by the angular rate sensor can then be used to distinguish true linear motion from the accelerometer readings. This allows for the capture of more complex movements than possible with the Wii Remote alone.

The Wii MotionPlus features a pass-through External Extension Connector, allowing other expansions such as the Nunchuk or Classic Controller to be used simultaneously with the device. The attachment has a color-coded mechanical slide switch for locking the clip release. When attached to the Wii Remote, the unit extends the length of the controller body by approximately 1+1⁄2 in (4 cm). Each Wii MotionPlus incorporates a longer version of the Wii Remote Jacket to accommodate the added length.

The device is only used by games that have been specifically developed to use its functionality. It can be left attached to the Wii Remote when playing games that do not support it without causing any problems, but it will not improve gameplay.