Genuine Dell 9RRC7 Black Optical USB Wired 3-Button Plug &amp; Play Mouse With Scroll Wheel， Compatible Dell Part Numbers: 356WK， 5Y2RG， 11D3V， MS111-P， 330-9456<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"> Connectivity : Wired - 4 pin USB Type A </span></li><li><span class="a-list-item"> Tracking Sensor : Optical LED </span></li><li><span class="a-list-item"> Cursor Tracking Speed (dpi) : 1000 dpi (Dots Per Inch) </span></li><li><span class="a-list-item"> Buttons Qty : 3 (Left， right &amp; Scroll Wheel) </span></li><li><span class="a-list-item"> Dimension (H x L x W) : 35.8 x 112.2 x 63.4 mm ， Weight : 90g ±10g(including cable)， Cable Length: 1800mm ±50mm </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31efPZ-bccL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31VU4dAvONL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31cEAxtIFsL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31A9EINQrnL.jpg" noproxy>