Vent Prevent carbon monoxide poisoning - When the CO concentration exceeds the standard, the detector gives an alarm and the red light flashes until the ambient gas volume drops below the alarm threshold . The electrochemical gas sensor in this CO detector is extremely sensitive to detect any CO leaks in your home The LED indicator flashes red and the alarm goes off with 85 dB volume to alert all family members when CO is detected Alarm Standby: Alert time depends on carbon monoxide concentration level. 50 ppm, alert within 60-90 minutes; 100 ppm, alert within 10-40 minutes; 300ppm, alert within 3 minutes. Wide Application -- This carbon monoxide detector is suitable for all places where carbon monoxide may occur, such as kitchen, bathroom , the bedroom, the v