ELECOM USB Wired Mouse with Trackball, Large Ball, 8 Buttons, Tilt Function, Black (M-HT1URXBK)

Power: USB bus powered (no batteries required) Buttons: 8 buttons (including wheel button) with tilt wheel Warranty: 6 months Compatible with: Windows PCs and Macintosh computers equipped with a USB interface The large 52mm diameter trackball delivers an unparalleled feel. The "HUGE" trackball mouse features a palm rest for index and middle finger operation, reducing wrist strain during extended PC use. Connection: Wired Dimensions: 114.7mm W x 181.9mm D x 57.2mm H The hole on the back allows for easy ball removal, facilitating maintenance of the ball and the internal ball holder.