Everyday use
The Apple Magic Mouse and Apple Wireless Mouse automatically enter a low-power mode to conserve battery power when you are not using them. To wake the mouse, click the mouse button.
Short-term storage
If you're not going to use the mouse for a few days, or if you are going to be traveling with your mouse, turn it off to save battery power.
To turn off your mouse:
- Turn over the mouse.
- Slide the power switch to the "off" position. The red light will be covered.
Power switch on the Apple Magic Mouse:

Power switch on wireless Mighty Mouse and Apple Wireless Mouse:

Long-term storage
If you're not going to use wireless mouse for more than a few weeks, remove the batteries before storing it.