2.4GHz Wireless Thumb-Operated Trackball Mouse, 6-Button Function with Smooth Tracking, Precision Optical Gaming Sensor (M-XT3DRBK), Black Connectivity Technology Wired, USB ELECOM Compatible Devices Windows PC Macintosh which with USB interface Model Name M-XT3DRBK Special ...2.4GHz Wireless Thumb-Operated Trackball Mouse, 6-Button Function with Smooth Tracking, Precision Optical Gaming Sensor (M-XT3DRBK), Black Connectivity Technology Wired, USB ELECOM Compatible Devices Windows PC Macintosh which with USB interface Model Name M-XT3DRBK Special Feature Thumb-Operation, 6 Functional Buttons, 2.4GHz Wireless, Ergonomic Design, Optical Gaming Sensor 《OPTICAL TRACKING TECHNOLOGY》The trackball provides precise cursor movement for superior accuracy so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency.