Insert two AA batteries (supplied) into the wireless mouse as shown. You can check your mouse's battery power level by clicking 
(wireless mouse icon), located in the Windows® taskbar notification area.
Do not mix old (used) and new batteries when replacing batteries in the wireless mouse. Always use the same type and manufacture of battery. Using incompatible batteries or mixing used/new batteries can damage the mouse.
Inserting batteries into the wireless mouse
If your wireless mouse does not operate properly, the batteries may need to be replaced. When your wireless mouse is not being used for extended periods of time, remove the batteries to avoid possible damage from battery leakage.
1 See your computer's specifications sheet for details about supplied accessories.
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