Thank you for viewing. This is a 50° angle adjustment stand for the MX ERGO mouse. I purchased it on Amazon last week and set it up with the mouse once, but the angle didn't suit me, so I'm selling it as almost new. The mouse is stable, and compared to using it without the stand, I think the angled position reduces wrist strain. This is a stand-only sale; the mouse is not included. ~Amazon Product Description~ Angle adjustment stand exclusively for Logicool MX ERGO and MX ERGO S Tilts further than the standard 20° tilt angle, enabling work at a natural hand angle. A stick is included that can be used when removing the ball, and it can be stored by magnetically fixing it when not in use. It has a smooth and simple design that fits the shape of the MX ERGO. The stand will not fall off even if you lift the trackball. - Model: Exclusively for Logicool MX ERGO, MX ERGO S - Angle Adjustment: 50° (+30°) - Design: Simple and smooth design - Color: Black - Compatibility: MX ERGO mouse stand