Sanwa Wired Therefore Trackball MA-TB177BK

The ergonomic design of this wired trackball reduces the burden on your wrist.;The new design allows you to lightly hold your hand from the side instead of placing it on top, reducing wrist twisting.;You can hold it at a natural angle, so it won't strain your wrist even if you use it for a long time.;This is a trackball, where you roll the ball with your finger to operate the cursor.;It uses a 34mm medium size ball that is just right for thumb movement.