USB 4D Finger Mouse with Trackball, Black

Average Price:$12 —— elegant design. for USB. off-table, for free and comfortable operation. avoiding eye fatigue and radiation harm. compatible with windows 95/98 and windows NT. can be operated in various ways, avoiding harm to palm joint or muscle. user doesn't have to sit close to the monitor by using this track mouse. can control the cross coordinates sensitively, simply with the thumb. all products are patented and pending in EPC, JAP, PRC, ROC, USA and other countries. color: black.