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.
I hate having to move my arm all the way across the table to move my mouse a crossed my two screens. This mouth was the answer a simple flick of my thumb accomplishes everything I need. Great battery life makes this a great buy.
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.
does this have an on off switch or does it switch off and on automatically