• Loud 85 decibel alarm
• Permanent carbon monoxide sensor
• The alarm sound pattern is four short alarm beeps. The red LED will flash while in the alarm mode.
• One chirp every 30 seconds in an indication that the battery is low (need replacement) (green LED still flashes once every 30 seconds).
• Test/Reset button to test the unit electronics and verifies proper unit operation and reset the unit during CO alarm.
• Alarm memory feature: If the unit ever alarms， pressing the button， green LED will flashes once every second for one minute and the peak alarm level will be indicated on the LCD.
• Green and red LED lights that indicate normal operation and alarm status.
• The unit will sound chirp and red LED flashes once as power up.
• Green LED: Flashes every 30 seconds to indicate the unit is operating properly. The green LED will also flash before CO reading is taken and when any button is pressed.
• Red LED: When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound.
• The carbon monoxide alarm pattern is 4 short beeps， followed by 5 seconds of silence， followed by 4 short beeps with a corresponding red LED flash. This cycle will continue for 4 minutes and then change to 1 cycle every minute until the device is reset or the CO is eliminated.

Specifications: