Logitech M570 Wireless Trackball Mouse: Easily use your computer for long periods of time with this trackball mouse, which allows you to precisely navigate features with minimal wrist movement. Enjoy lasting comfort thanks to the sculpted shape, which supports the curves of your hand.
Love my new Trackball. Did not give 5 stars just becuase once in a while it does not register movement as direct as I would like it. Otherwise so far it has worked great.