[. . . ] Important: Remember do not put the batteries in the wrong direction; use the same types of batteries. If any spill occurs on the receiver, unplug the USB connector first and clean the receiver immediately. [. . . ] If any spill occurs on the receiver, unplug the USB connector first and clean the receiver immediately. Please switch the button to "off" under the mouse once you don't use it for a long time, and remove the batteries if you do not use this device for at least two weeks. Please do not use wireless laser mouse on a desk, which is made of glass or mirror. Also, a flat surface is necessary or the laser sensor will error easily. When you use wireless laser mouse on a desk that is made of metal, try using a pad and reduce the receiving distance. For security, the mouse and keyboard won't work. 5. If you want to unlock this function, just press " "again, and install your password. Factory Setting 3 ENGLISH Button Assignments 1. Left Button: Provides traditional mouse functions like click, double click and drag. Right Button: You can assign this button to frequently used keyboard and mouse functions in addition to features like Easy Jump, Auto-Panning, Zoom, etc. Magic-Roller: Press the "Magic-Roller" to surf the Internet and Windows documents. Horizontal Scroll: Press the roller to the left and the cursor scrolls to the left; press the roller to the right and the cursor scrolls to the right. [. . . ] Magic-Roller: Press the "Magic-Roller" to surf the Internet and Windows documents. Horizontal Scroll: Press the roller to the left and the cursor scrolls to the left; press the roller to the right and the cursor scrolls to the right. [. . . ]