Acer Aspire 1680 - Manual (Page 35)

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Audio
The computer comes with 16-bit high-fidelity AC’97 stereo audio and
microphone. The built-in dual stereo speakers are easy to access.
There are audio ports on the front panel of the computer. See “Closed
front view” on page 5 for more information on external audio devices.
Adjusting the volume
Adjusting the volume on the computer is as easy as pressing some but-
tons. See “Hot keys” on page 18 for more informations on adjusting
the speaker volume.
Power management
This computer has a built-in power management unit that monitors
system activity. System activity refers to any activity involving one or
more of the following devices: keyboard, mouse, hard disk, peripherals
connected to the USB ports, and video memory. If no activity is
detected for a period of time (called an inactivity timeout), the
computer stops some or all of these devices in order to conserve
energy.
This computer employs a power management scheme that supports
Advanced Configuration and Power Interface (ACPI), which allows for
maximum power conservation and maximum performance at the same
time. Windows handles all power-saving chores for your computer.