We have replaced this mouse with the ACT Wireless Ergonomic Mouse 1600 DPI.
The Ewent EW3156 Vertical Ergonomic Mouse EW(3156) is a good solution for many people who spend more than a few hours a day behind a computer. By using this ergonomic mouse, many common hand/mouse-related complaints are reduced and even prevented. Due to the vertical design of the mouse, the hand, wrist and forearm are in a natural position allowing you to work comfortably.
Ergonomic mouse that relieves common hand/wrist/shoulder/neck related complaints
For better hand, wrist and arm posture
Vertical mouse with a pleasant hand position to work comfortably
Specifications Vertical Ergonomic Mouse:
Type Vertical ergo mouse
dpi 1000
Connection Wired (USB)