| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm wherein easiness of listening of battery shutoff alarm sound or the like is secured and wherein a battery service life can be maintained for a long period. SOLUTION: When a smoke detection part 20 or a heat detection part 30 decides that it is abnormal or when a battery voltage monitoring circuit 60 decides that a voltage drops, a control part 10 makes a sound amplifier 42 increase a sound pressure level of a sound alarm as compared to a sound pressure level of electronic sound and raise the sound alarm. COPYRIGHT: (C)2011,JPO&INPIT |
