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.
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I wish the wired version was still available, but I have been happy with this iteration of the wireless trackball. Logitech has improved the functionality. The button assignments were easy to do, and they work. Since this is now the only fixed trackball mouse, it's nice that it works well.
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