Optical Tracking TechnologyThe ELECOM "EX-G PRO" 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. Wired / wireless / bluetooth connectivities are available FUNCTIONAL 8 BUTTONSYou can assign favorite function to each button by using "ELECOM Mouse Assistant" ELECOM Mouse Assistant Software will be available to download from ELECOM NET website.