Specifications 2.4GHz Wireless Trackball Mouse Trackball mouse Product Infomation:Dual design: ... :400,600,800,1200*Effective distance within 10M.*Working Frequency 2.4GHz.*Help prevent Musculo-Skeletal DisordersDetail Information: 1). Work distance: ... 10 meters,high resolution.2). Radio frequency: 2402MHz—2480MHz 3). Radio channel: 16 channels, ...