Trackball Mouse, Corded, Optical, Number of Buttons 4, Black, Connector Type USB/PS2, Compatible With PC/MAC(R), Height 9 3/4 in, Length 9 3/4 in, Width 3 1/2 in, Features 4 Button, Scroll Wheel, Includes Software
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.