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Stop chasing a mouse around : Your trackball stays in one place and puts control under your thumb, so you don't have to move your arm to move your cursor. And its ergonomic shape supports your hand for comfortable control all day long
Wireless Unifying Receiver : This trackball includes the Logitech Unifying receiver. The tiny wireless USB receiver stays in your laptop, so there's no need to unplug it when you move around. Plus, you can easily add a compatible keyboard, number pad or mouse – without the hassle of multiple USB receivers
Long Battery Life : You can go for up to 18 months without changing batteries. Plus the convenient battery indicator helps to ensure that you'll never be caught off guard
Versatile : You get precise cursor control wherever you want to use your trackball mouse. Hard tables, comfy sofas and lumpy beds are all no problem for the Logitech M570
Easy to Use : The integrated scroll wheel and easy-to-reach Back/Forward buttons make control simple, whether you're Web surfing on a laptop or navigating a home-theatre Windows PC
Upgrade to MX Ergo Trackball for greater comfort : adjustable hinge, more natural hand position, USB/Bluetooth, soft rubber grips, horizontal scrolling
Logitech M570 Trackman™ Wireless Trackball Mouse 2.4GHz with Unifying USB-Receiver Scroll Wheel Programmable Buttons 18-Month Battery Life PC Mac Laptop Mouse B0042BBR2S