Mouse Genius DX-150X Black:Optical Mouse features a non-slip cast down, which makes the mouse fits perfectly in your hand and great to handle. Resolution of the value of 1200 dpi provides high accuracy. Part mice are standard three buttons, one of which functions as the paging wheel. Given that this is a Plug and Play device does not need to install any software.The Genius DX-150X optical mouse offers a non-slip surface, which makes the mouse fit perfectly into your hand and super easy to use. The 1000 dpi resolution provides high accuracy. As part of the mouse, there are three standard buttons, one of which functions as the page scrolling wheel. Since this is a plug-and-play device, you wont have to install any software whatsoever.Key FeaturesErgonomic mouseOptical sensor in 1000 dpi resolutionA textured surface for a better grip2 buttons and a scrolling wheel as the 3rd buttonPlug-and-play