Dell XPS M2010 (MXP061, Mid 2006) - Manual (Page 80)

storms or after power interruptions. Some surge protector manufacturers include warranty coverage for certain types of damage. Carefully read the device
warranty when choosing a surge protector. A device with a higher joule rating offers more protection. Compare joule ratings to determine the relative
effectiveness of different devices.
Many surge protectors have a telephone jack for modem protection. See the surge protector documentation for modem connection instructions.
Line Conditioners
Line conditioners are designed to maintain AC voltage at a fairly constant level.
Uninterruptible Power Supplies
A UPS protects against power fluctuations and interruptions. UPS devices contain a battery that provides temporary power to connected devices when AC
power is interrupted. The battery charges while AC power is available. See the UPS manufacturer documentation for information on battery operating time and
to ensure that the device is approved by Underwriters Laboratories (UL).
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NOTICE: Most surge protectors do not protect against power fluctuations or power interruptions caused by nearby lightning strikes. When lightning
occurs in your area, disconnect the telephone line from the telephone wall jack and disconnect your computer from the electrical outlet.
NOTICE: Not all surge protectors offer network adapter protection. Disconnect the network cable from the network wall jack during electrical storms.
NOTICE: Line conditioners do not protect against power interruptions.
NOTICE: Loss of power while data is being saved to the hard drive may result in data loss or file damage.
NOTE: To ensure maximum battery operating time, connect only your computer to a UPS. Connect other devices, such as a printer, to a separate power
strip that provides surge protection.