[. . . ] Fit in the batteries accordingly to the diagram indicated in the battery cabinet. The Low Power LED on the wheel bar will blink 3 seconds if the mouse power is on. Safety Notice This product complies with IEC 60825-1, Class I laser product. [. . . ] To function the 4-way scrolling in some applications in Window VISTA such as Word, Excel, PowerPoint and etc. , the driver should be installed. B. However, In order to make the 4-way scrolling function effective, you required to install the software driver. 1. Un-install or removing the current mouse driver Before installing the driver of the mouse, we suggest that you check if any other mouse driver installed in your system. If yes, in order not to make conflict, please un-install or remove that driver before installing the mouse. Install the mouse 4-Way Scrolling driver a. Select setup. exe to install the driver from the CD. b. or you can download the 4-Way Scrolling driver from vendor's website. ID links OK! Execute ID connection software Press ID reset button Note While the mouse is working, if encountering any interference, the mouse and the receiver will automatically source out and transfer to another free channel. During the transferring, the cursor movement may have a second delay. ¡· Trouble Shooting 4. Replace the new batteries Please replace a pair of new batteries and follow the previous instructions. (2, 3) Note The red LED on the scroll wheel is the low batteries power indicator. It indicates that batteries inside the mouse are needed to be replaced. a. [. . . ] To have the batteries with a regular check and replace new batteries if not used for a long time. Mixing old and new batteries or mining types (such as alkaline with zinc carbon) will reduce overall performance and could cause leakage or rupture. [. . . ]