136 Traveling With Your ComputerNOTICE: If the computer has been exposed to extreme temperatures, allow it toacclimate to room temperature for 1 hour before turning it on.• Protect the computer, the batteries, and the hard drive from hazards suchas extreme temperatures and overexposure to sunlight, dirt, dust, orliquids.• Pack the computer so that it does not slide around in the trunk of your caror in an overhead storage compartment.Travel TipsNOTICE: Do not move the computer while using the optical drive to prevent loss ofdata.NOTICE: Do not check the computer as baggage.• Consider disabling wireless activity on your computer to maximize batteryoperating time. To disable wireless activity, press.• Consider changing your power management options (see "ConfiguringPower Management Settings" on page 50) to maximize battery operatingtime.• If you are traveling internationally, carry proof of ownership—or of yourright to use the computer if it is company-owned—to speed your passagethrough customs. Investigate the customs regulations of the countries youplan to visit, and consider acquiring an international carnet (also known asa merchandise passport) from your government.• Find out what type of electrical outlets are used in the countries you willvisit, and have appropriate power adapters.• Check with your credit card company for information about the kinds ofemergency travel assistance it offers to users of portable computers.