| 摘要 |
PROBLEM TO BE SOLVED: To reduce the consumption of a battery by limiting a period when an announcing part makes announcement. SOLUTION: When an announcement request signal NO is issued, an announcing part M2 outputs a 24 hour timer confirmation signal N5 to a 24 hour timer part M5, and in determining that a time, date, day or time are within an arbitrarily set announcement signal output enabling period, the announcing part M2 outputs an announcement signal output permission time zone signal N6, and makes announcement. Thus, it is possible to reduce the consumption of the battery of a gas blocking device. COPYRIGHT: (C)2004,JPO
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