Electronics Perixx PERIMICE-720, Wireless Ergonomic Trackball Mouse with Adjustable Angle, Black (11449)

ADJUSTABLE ANGLE: Unique detachable risers 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; Dimensions: 5.47 x 4.06 x 1.97 inches
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, 10-degree stand, 20-degree stand, manual