| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the portable telephone is weak in heat and causes a trouble in its functions, if a fixed limit temperature is exceeded, but, unlike troubles caused by shocks or submergence, the high temperature troubles apparently little change and hence the user and the maker much dispute about which party is responsible to the cause of troubles. SOLUTION: An irreversible temperature indicating label 5 which colors at a predetermined temperature and continues its coloring state once colored even after a temperature change is pasted to a battery mounting recess 4 of the telephone body 1 or the backside of a battery pack 3.
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