Perixx PERIMICE 720 Wireless 2.4 GHz and Bluetooth Ergonomic Trackball Mouse, Adjustable Angle, 2 DPI Level, White

ADJUSTABLE ANGLE: A unique detachable stand to customize the angle of the mouse from 0 to 10 or 20 degrees to minimize strains on wrist and arms SCULPTED DESIGN: Supports your hand comfortably and let it rest on the mouse. It is easy to use, no driver is needed. WIRELESS DUAL MODE: Switch between two devices via Bluetooth or wireless 2.4 GHz connection TILTED-SCROLL-WHEEL: Middle click function; scroll horizontally as well as vertically, using a tilting scroll-wheel SYSTEM REQUIREMENTS: Window 7, 8, 10 and above; Package includes: PERIMICE-720 (Not programmable), 10-degree stand, 20-degree stand, manual