Understanding your alarm is very important especially when in danger. Since this alarm features both Smoke and Carbon Monoxide detection, it is critical to know which is happening in your home. When there is a high carbon monoxide level, your alarm will beep four (4) times and will also display a red LED hue. When the alarm detects a fire in your home, the alarm will beep three (3) times and will display a red LED hue. In addition to this, when your alarms are wirelessly interconnected, the voice and location feature will tell you not only what type of emergency it is (smoke or CO) but also the location of the danger.