2.4 GHz connectivity provides fast transmission and virtually no delays Micro-precise scrolling makes everything you love to do online easier Contoured shape keeps your hand happy through hours of use Unifying receiver allows simultaneous use with compatible devices 18-Month Battery life delivers lasting use without frequent Battery changes Note: In case of Wireless mouse, the USB receiver will be provided inside or along with the mouse Micro-precise scrolling: New designed-for-web scrolling makes searches, shopping and browsing easier