compliant RJ-11 modular plug.PC Cards may become very warm during normal operation. Use care when removingPC Cards after their continuous operation.Before you clean your computer, remove power. Clean your computer with a soft clothdampened with water. Do not use liquid or aerosol cleaners, which may containflammable substances.Power (Safety Instructions, continued)Use only the Dell-provided AC adapter approved for use with this computer. Use ofanother AC adapter may cause a fire or explosion.Before you connect the computer to an electrical outlet, check the AC adapter voltagerating to ensure that the required voltage and frequency match the available powersource.To remove power from the computer, turn it off, remove the battery pack, anddisconnect the AC adapter from the electrical outlet.To help prevent electric shock, plug the AC adapter and peripheral power cables intoproperly grounded power sources. These power cables may be equipped with three-prong plugs to provide an earth grounding connection. Do not use adapter plugs orremove the grounding prong from the power cable plug. If you use a power extensioncable, use the appropriate type, two-prong or three-prong, to mate with the AC adapterpower cable.Be sure that nothing rests on your AC adapter's power cable and that the cable is notlocated where it can be tripped over or stepped on.If you are using a multiple-outlet power strip, use caution when plugging the ACadapter's power cable into the power strip. Some power strips may allow you to insertthe plug incorrectly. Incorrect insertion of the power plug could result in permanentdamage to your computer, as well as risk of electric shock and/or fire. Ensure that theground prong of the power plug is inserted into the mating ground contact of the powerstrip.Battery (Safety Instructions, continued)Use only Dell battery modules that are approved for use with this computer. Use of other