[2][3][4][5] The mouse emits a faint clicking sound when the scroll ball is rolled or the side squeeze sensors are depressed, but this is not directly caused by the ball moving or side buttons being pressed; the sound is actually produced by a tiny speaker inside the mouse.

[needs update] When used with Mac OS X, the sensors can be set to launch applications or trigger features of the Apple operating system, such as Dashboard and Exposé.

[14] Prior to launching the device, Apple received a license to the name "Mighty Mouse" from Viacom, and subsequently CBS Operations, as owner of the Mighty Mouse cartoon series, the title having been registered in the US as a trademark with respect to various merchandise (such as T-shirts and multivitamins) associated with the character.

[16] On May 21, 2008, it was announced that Man & Machine Inc., a supplier of keyboards and mice to laboratories and hospitals, had sued Apple Inc. for trademark infringement over its use of the name Mighty Mouse.

Following opposition proceedings on both sides against the other, CBS subsequently withdrew its application, allowing Man & Machine to register the US trademark for computer mice.

[21] Incidentally, CBS was successful in registering "Mighty Mouse" as a trademark for computer mice in some other countries, including Canada,[22] although Apple nevertheless chose to change its product name internationally.