1st and 2nd alarm is my own terms from testing.
At 1st alarm, pump must continue to operate (alarm 30 minutes before i.e. 30分前止). This is to allow time to arrange new pump or power supply.
At 2nd alarm, pump should stop, but alarm must continue for at least 3 min.
For this alarm, the sound should continue until manually stopped, or the battery "life" is gone. What they mean is, do not use a timer to terminate the alarm (e.g. 3 minute timer). Allow the alarm to continue as much as possible. It is still OK to terminate the 2nd alarm alarm if battery voltage goes below a certain point, e.g. to prevent battery damage, as long as >3 min is provided.
At 1st alarm, pump must continue to operate (alarm 30 minutes before i.e. 30分前止). This is to allow time to arrange new pump or power supply.
At 2nd alarm, pump should stop, but alarm must continue for at least 3 min.
For this alarm, the sound should continue until manually stopped, or the battery "life" is gone. What they mean is, do not use a timer to terminate the alarm (e.g. 3 minute timer). Allow the alarm to continue as much as possible. It is still OK to terminate the 2nd alarm alarm if battery voltage goes below a certain point, e.g. to prevent battery damage, as long as >3 min is provided.