Dell MS5120W Mobile Pro 1600DPI Optical Wireless Mouse with Two Programmable ButtonsA 1600 DPI sensor ensures this Dell MS5120W Mobile Pro Wireless Mouse handles high resolution screens easily. Its optical sensor offers accurate tracking and ensures excellent mouse sensitivity and flawless response. Two programmable shortcut buttons let you quickly move through the web pages or you can map these buttons to your preferred commands or applications. Rigorous testing ensures that this mouse is designed to work perfectly with Dell