Marble MouseProvides the convenience of a trackball with the familiarity of a mouse.Optical tracking system replaces traditional mechanical parts Move your cursor with the touch of a finger Comfortable shape fits either the left or right hand ### Logitech 轨迹球鼠标由于 Logitech 的专利光学技术取代了传统机械部件，因此这些光学轨迹球可提供出色的精度和平稳运动。 轨迹球设计可减少手动和腕移动，这意味着无需在桌面上到处移动鼠标。