Lenovo ScrollPoint 31P7405 User Manual page 20

4. Insert two AA batteries into the battery compartment according to the polarity indicators.
Figure 6. Installing the mouse batteries
CAUTION:
There is a risk of explosion if a battery is replaced by an incorrect type. Dispose of used batteries
according to the instructions.
5. Close the battery compartment cover and slide it forward until it clicks into place.
Figure 7. Closing the battery compartment cover
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Lenovo Combined Mouse User Guide