51�Թ���

A finger presses the test button on a residential combination smoke and carbon monoxide detector. The detector sounds an alarm, which triggers other alarms and speaks, “fire, fire” followed by, “carbon monoxide, carbon monoxide.” Detectors like this should be tested weekly or monthly to ensure proper operation. The sound in this clip is annoying and the single beep would make a good frustration metaphor as the sound tends to come at the worst time when the batteries are low.