Lenovo ThinkCentre M625q 10TG User Manual And Hardware Maintenance Manual page 22

Replacing the wireless mouse
1. Disconnect the USB dongle from your computer. Then, remove your old wireless mouse.
2. Remove the new wireless mouse from the package.
3. Open the battery compartment cover, and install two AAA batteries according to the polarity indicators.
a. Open the battery compartment.
Figure 11. Opening the battery compartment
b. Take out the USB dongle.
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ThinkCentre M625q User Guide and Hardware Maintenance Manual