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Chapter 3 Using Your Computer 45
Connecting Speakers and Audio Devices
Your iBook G4 comes with two built-in speakers, a built-in microphone, and a
headphone (audio line out) port.
You can connect external speakers, headphones, and other sound output devices to
the headphone port. The headphone port is a stereo 3.5 mini-phono jack.
You can record sound onto your hard disk using the built-in microphone. You can also
connect external USB microphones or other audio equipment to the USB port. For
applications, such as iMovie, that can record sounds, use the Sound pane of System
Preferences to select the audio input device you want to use, including microphones
connected via USB.
The volume controls on your keyboard allow you to easily change volume. You can also
access these controls from the Sound pane of System Preferences.
For more information about using or troubleshooting sound on your computer, open
Mac OS Help and search for “sound.”
Battery
When the external power adapter is not connected, your computer draws power from
its battery. Depending on the applications you use and external devices connected to
your iBook G4, you may find that the length of time that you can run your iBook G4 off
one battery charge varies. Turning off features such as AirPort Extreme or Bluetooth®
wireless technology can help to conserve battery charge. For more information about
using your battery, see “Charging a Battery” on page 47.
You can determine the charge left in your battery by looking at the battery level
indicator lights on the battery itself. Press the button next to the lights and the lights
glow to show how much charge is left in the battery. The indicator lights remain lit for
a few seconds after you press the button. You can check the charge with the battery in
or out of your iBook G4.
If your battery runs low while you are working, attach your power adapter and let the
battery recharge. If you want to replace the battery with a charged one, attach the
power adapter, shut down your iBook G4, and replace the battery. If you replace the
battery without the power adapter attached, you may lose information and settings
such as the date and time.
LL2541Q7X.book Page 45 Wednesday, March 3, 2004 2:52 PM