The Wireless Mighty Mouse was a Bluetooth version of the (corded) Mighty Mouse that was released a year before it. The original Wireless Mighty Mouse used the same opaque white coloration as the corded Mighty Mouse.
The Mighty Mouse was the first Apple mouse to have multiple buttons. The buttons consisted of two touch-sensitive areas on the top of the mouse and two “squeeze areas” on the sides of the mouse. Because it had no physical buttons, the entire body of the mouse could be clicked. The top of the mouse also had a mini free-spinning track ball that allowed scrolling in any direction.
The Wireless Mighty Mouse makes a sound when the scroll ball is rolled that is produced by a tiny internal speaker in the mouse. The sound cannot be disabled by settings.