Groovy Handy Trackball Mouse [Analog Sensor] USB Connection White GM-OPTB02W

Handy trackball mouse that can be used one-handed, whether lying down or standing. Buttons: 2 buttons + 1 trigger + scroll Reading method: Optical 600dpi Connection terminal: USB 2.0/1.1 (A-type, male) USB cable length: Approximately 155 cm Size/weight: 77 x 48 x 55 (mm) / 90 g Compatible OS: Windows 8/7/VISTA/XP/2000/Me, MAC OS X (9.0 or later)