Used diameter 2.5mm big Artificial ruby as support ball; You can feel new type left hand operational Wireless trackball mouse with improved smooth tracking by new function and certain basic performance. The gaming grade high-performance optical system sensor provides outstanding tracking performance. Diameter 2.5mm artificial ruby large support balls reduce maintenance frequency. ?Interface?USB ?Connector type?USB(A)male ?Supported devices?Windows PC, Macintosh equipped with USB Interface ?Supported OS?Windows10, Windows RT8.1, Windows 8.1, Windows 7, Windows Vista, Macintosh OS X 10.10 ?Update to latest version of each OS and installation of service pack may be necessary. Horizontal Scroll is not available at Windows 8.1RT ?Resolution?750/1500 counts Reading method?Optical sensor method ?Number of buttons : 6 ?Wheel button included ?Number of wheels : 1 (vertical/horizontal) ?Communication method?GFSK method Radio frequency?2.4GHz band ?Radio wave outreach?When used on magnetic material (including desk with iron):3m when used on non-magnetic material:3m?Receiver storing?? ?Continuous operating?About?125 hours in low energy mode/About 76 hours in high speed mode Continuous standby time?About?694 days in low energy mode/About 694 days in high speed mod Estimated battery life?About?273 days in low energy mode/About 176 days in high speed mode Power supply (the body)?AA alkaline dry cell, AA manganese dry cell, either one of the AA nickel-metal hydride rechargeable. ?Power supply voltage?1.5V ?Color?Black Dimensions (Mouse)?Width 94.7* depth 124.4* 47.9mm in height ?Dimensions classification?Large size ?Weight (Mouse)?About 128g ?We do not include battery ?Dimensions (receiver)?Width 13.1* depth 18.2* 5.0mm in height ?Weight (receiver)?About 2g ?Accessories?AA alkaline dry cell *1 for operation check, User manual *1(Japanese).

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