Bluetooth is a communications service built into all Macs. Bluetooth communicates with wireless keyboards and mice and wireless headsets. Some cell phones can sync with the Mac using Bluetooth as well.
If you are using a MacBook or MacBook Pro, chances are that you aren't using any of these Bluetooth devices. However, Bluetooth is turned on by default and it uses battery power whether you are using it or not. If you aren't using your notebook Mac with a Bluetooth device, you can extend your battery life by turning Bluetooth off.
To turn off Bluetooth, look for the Bluetooth icon on the right side of the menu bar. (see illustration) Click it and choose Turn Bluetooth Off. The icon will go grey to show you that Bluetooth is off.
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