USB Finger Trackball Black -- MS4-USB
from SFCable.com

USB Black Finger Track Ball. Features: Off-table reducing the harm of radiation and body fatigue owing to using the mouse for a long time. Can be operated in various ways to avoid harm of palm joint or muscles Free and comfortable operation ideal for using on planes trains and cars 3D Page scrolling... [See More]

  • Mounting: Handheld
  • Interface: USB
  • Applications: General Purpose
Libra 90
from iOne / Qumax Corporation

51 mm opto-mechanical trackball [See More]

  • Mounting: Handheld
  • Dimensions: 192x119x60mm(L*W*H)
  • Resolution: 400 dpi
  • Applications: General Purpose