Turning Bluetooth off can save your MacBook battery, so if you are not using Bluetooth then its a good idea to turn it off.
Turn Bluetooth off on Mac OS X Snow Leopard
- Click on Apple menu and select “System Preferences”.
- Click on “Bluetooth” icon under “Internet and Wireless” section.
- Uncheck the “On” checkbox if its already checked.
To turn Bluetooth On use the same method, this time Check the “On” checkbox if its unchecked already.
How to AirPort On/Off