Thank you for viewing. I am selling this item, which I purchased here, because I have switched to a different mouse. I used it for 2-3 months. This is a two-axis adjustable tilt stand that allows you to adjust the posture of the logicool trackball mouse ERGO M575 series to your preferred angle. Compatible with M575S, M575SP, and M575SPd. 【Features】 ① You can adjust the tilt angle from 20 to 40° / ② You can adjust the pronation angle from -15 to 15° in 5° increments. There are many non-slip pads on the back, so you can operate the mouse without slipping. There are also holes for switch operation and ball ejection. 【How to Use】 A Phillips screwdriver is required for angle adjustment. When adjusting the tilt angle, also adjust the height by sliding. 【Other】 ・The mouse itself is not included.