The carbon monoxide detector continuously monitors carbon monoxide levels to keep your family safe. Powered by 2 * 1.5V AAA batteries (not included), it is portable and easy to install, requires no outlet, is not affected by power outages, and can be installed anywhere! Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, regardless of where the detector is placed in the room. To ensure complete protection, be sure to place one on each floor of your home and in each bedroom. Easy to use, with a single test/reset button, when a dangerous level of carbon monoxide is detected, the red LED will flash and a loud alarm pattern will sound - Loud 85 decibel alarm with LED flash. Alarm standard: 50 ppm, alarm within 60 to 90 minutes; 100 ppm, alarm within 10 to 40 minutes; 300 ppm, alarm within 3 minutes. Note: Do not use gas by blowing directly into the hole when testing the detector. All CO alarms are rigorously tested to meet UL standards. The carbon monoxide detector uses electrochemical sensing technology to protect families. It is very convenient for us to install and use. Test/reset button, green LED light indicates the alarm is working correctly, red LED light indicates dangerous levels and the alarm sounds an end-of-life warning. Low battery signal and \"end of life\" warning ensure the detector ALWAYS monitors your safety. Digital backlight display Low power consumption alarm: a \"built-in\" every 30 seconds is a clue. Standby current: