NOOK User Guide Safety and Care 40Temperature RangesYour NOOK should function as designed in these temperature ranges:Use Fahrenheit CelsiusCharging 41– 95 ºF 5 – 35 ºCOperation 32 – 104 ºF 0 – 40 ºCStorage 5 – 113 ºF -15 – 45 ºCOutside of these ranges, your NOOK might develop power, display, and/or software issues. Iftemperatures are extremely cold or hot, permanent physical damage can result. Such damage isnot covered by the warranty. Storage applies to temporary locations like the trunk of your car (orother motor vehicle) as well as long-term storage.Even on a day that is not very hot, the passenger compartment or trunk of a car can beextremely hot. Do not leave your NOOK in a car.High storage temperatures reduce battery life. For more information, see “ChargingRecommendations” on page 22.Water and WeatherYour NOOK has a degree of water resistance, for example, to a misty fog. (We do want SanFrancisco residents to buy NOOKs.) If your NOOK gets damp, just dry the surface with a clean, drycloth before you put it away. But don’t let your NOOK get too wet. It is not water proof. If it doesget wet, let it dry completely before using it.Reading ScreenYou do not need to touch the reading screen, and should try to not do so. Fingerprints canpermanently damage the reading screen if they are not removed. If the screen gets fingerprints,grime, dust, or water on it (or for that matter, red wine, spaghetti sauce, or mustard), you shouldclean it with a damp soft cloth (for example, a micro-fiber cloth). Do not use any chemicals to cleanthe reading screen.The reading screen has a scratch-resistant coating, but it is possible to scratch the screen, so youshould clean it carefully. Keeping the screen clean in the first place is a better strategy than cleaningit. You should clean it infrequently, not often.Color TouchscreenThe color touchscreen is meant for touching, but you should also clean it. You might clean it afterseveral days of use, or if you notice the screen needs cleaning. Clean the touchscreen with a dampsoft cloth (for example, a micro-fiber cloth). Do not use any chemicals to clean the touchscreen.