Wired Ergonomic Trackball Mouse, Silent Noiseless Optical Sensor Mice, (600/800 / 1200/1600 Adjustable DPI, 34mm trackball) Compatible with MacBook, Laptop, Windows, Mac OS

"The birth of, SANWA Trackball Mouse. "
Carefully carved, unique innovation. Choose SANWA, longer service life, just for you to like. The carefully sculpted shape gives your hand full palm and finger support, while the quality material ensures a good, comfortable grip for long hours of work. Trackball Comfort
You will not need to mouse around to move the cursor as thumb controlled trackball stays in one place. Not only work on flat surfaces, but also on your leg, sofa and other surfaces as well. Conveniet Controls
Quipping with 34mm trackball and 5 buttons, a full control of everything is within your fingers. Adjustable DPI
The cursor speed can be switched in 4 steps of 600, 800, 1200, and 1600 counts. When the count switch button is pressed, the DPI is notified by the number of flashes. Ergonomic Design
An ergonomic trackball that fits with the palm of your hand. Minimizing the repetitive movements of wrist and palm will further prevent long-term muscle sores. Comfortable Finger Rest
This mouse is a sensible choice for home, travel, gaming, or work. Plug and play, no driver required. Optical Tracking
A optical sensor provides the users with smooth and precise cursor control.