Kensington 64321 Wireless Studio Mouse USB Rechargeable Batteries - Finally go wireless without worrying about expensive replacement batteries DiamondEye&#8482; Optical Technology - Allows you to work on nearly any surface with accuracy and ease Unique Scroll Sensor - Improved scrolling allows you to speed up or down the page by pressing and holding the sensor MouseWorks Software - Award-winning software for programming buttons and simplifying everyday tasks