ADJUSTABLE ANGLE: Unique detachable base to raise the mouse at different angles of 0, 10, or 20 degrees to reduce wrist painERGONOMIC DESIGN: Supports the hand and allows it to rest comfortably on the mouse; Dimensions: 13.9 x 10.3 x 5 cmDUAL-MODE WIRELESS: Switch for two devices via Bluetooth or 2.4 GHz wireless connection4-WAY SCROLL WHEEL: Middle click function; Horizontal and vertical scrolling by using the tiltable scroll wheelSYSTEM REQUIREMENTS: Windows 7, 8, 10; Package contents: PERIMICE-720, 10-degree base, 20-degree base, manual 
