NEC MH240 User Manual page 7

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Follow the instruction below when you use a battery pack. They may cause heating, explosion,
and fire;
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Do not put the battery pack into a microwave oven or a pressure chamber.
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Do not use other batteries with this battery pack.
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If the internal battery liquid gets onto your skin or clothes, immediately rinse it with clean water
to prevent chemical damage to your skin and clothes.
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Do not use the phone or recharge the battery in a place where fire or explosion may occur.
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This phone system does not have explosion protection. Do not use it where a flammable gas
such as propane and gasoline are stored. Turn off the power of the phone immediately. Do
not recharge the battery in such a place.
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Do not use near microwave ovens, medical equipment and industrial equipment.