Logitech M570 Wireless Trackball， Computer Wireless Mouse， Long Range Wireless Mouse<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Trackball comfort: Sculpted shape supports your hand and stays in one place—move the cursor without moving your arm </span></li><li><span class="a-list-item"> Work and play anywhere: Get smooth， precise cursor control wherever you use your trackball—your desk， couch， even your bed </span></li><li><span class="a-list-item"> Logitech Unifying receiver: Connect up to six Unifying compatible devices with one tiny wireless receiver that stays in your laptop </span></li><li><span class="a-list-item"> Long battery life: Go for up to 18 months without changing the included AA battery* (*Battery life may vary based on user and computing conditions) </span></li><li><span class="a-list-item"> For Windows or Mac OS: Robust 2.4 GHz wireless connection lets you control your laptop， desktop computer or home theater PC wirelessly from up to 30 ft. away** (** Actual wireless range will vary with use， settings and environmental conditions) Please refer the User Manual before use. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41cNmbZDrqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41tILLG5ADL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Ku%2BGN7vrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41PF9A11AQL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41MgJHBME8L.jpg" noproxy>