The Delux DLK-8050 is a three-button mouse with two additional options integrated into the scroll wheel. By pushing the scroll wheel left or right, users can navigate backward or forward while browsing the internet on any browser, making it a convenient choice without the need for extra side buttons. Additionally, the mouse buttons are programmable, allowing users to customize their functions according to their preferences. Overall, it's an excellent mouse offering convenient browsing features and programmable buttons to enhance user experience.