This carbon monoxide alarm is powered by 3x AAA batteries so it provides complete protection, even in the event of a power cut. It has 2 LED's: A green one to show the DC power is present, and a red when it is in alarm mode. It includes a test/ reset button to test the CO alarm circuit operation and allows you to silence the alarm. It has an end of life alarm to alert you to replace it after a minimum of 7 years protection.
Kitemarked to EN50291-1:2010.