Best Finger Trackball Mouses

"DEFT" is outstanding operational performance 8 button model mouse. It will change your common sense of index finger mice. There are 8 buttons for left, right, back, forward, 3 function buttons and wheel button. The gaming grade high-performance optical system sensor and new-style high-performance lens 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. ■Resolution：750/1500 counts Reading method：Optical sensor method ■Number of buttons : 8 ※Wheel button included ■Number of wheels : 1 (vertical/horizontal)■Communication method：GFSK method Radio frequency：2.4GHz band ■Radio wave outreach：When we use on one of magnetic material (including desk of iron): When we use on 3m, one of nonmagnetic material (including desk of tree): 10m button 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 mode 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 112g ※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.