User manual Wireless 7-buttons Rechargeable Mouse DL-2090H

3. After finishing the process, select "Restart" to reboot your system and
activate multimedia hot keys and wheel scrolling functions.
RF Office-Web Mouse Hot-Key Functions
  When you install the driver the hot keys will be enable with driver default.
  The Office-Wheel Function is attached on the mouse software as following.
Users can change the default function of wheel and extra hot-keys.