An essential life saver needed in every home with gas or solid fuel heating, position in all rooms with boilers, stoves, or open fires. Carbon monoxide is a tasteless and odourless gas that can be lethal, and isn't something smoke detectors pick up. Also a great travel accessory, if you're staying in hotel accommodation, or even camping, barbecues or multiple candles in a small enclosed spaces like vans and tents can potentially cause carbon monoxide poisoning. Battery powered to allow the unit to remain functional in the event of a power cut, and it even comes with the 3 x aa batteries, so can be used straight away. Gives a very loud 85db alarm if poisonous gas is present, and incorporates an lcd display screen with onstantly shows the current co levels. Tested in an approved laboratory in the uk to ensure full compliance to new en50291 1 2018 certificationcontinually monitors with a loud alarm on detection of carbon monoxideup to 10 years working life spanlcd display shows the current particle sampling countled status indicators green for power, amber for fault and red for alarmbattery powered to allow the unit to remain functional in the event of a power cutlatched battery compartment designed to prevent alarm from being fitted with no batterywarning this apparatus should be installed by a competent person and is to be installed according to the manufacturers instructionsbatteries3 x alkaline aa suppliedalarm level85db 3msensorelectromechanicaloperating temperature 10°c to 45°cco alarm level27ppm 55ppm within 60 to 90 mins, 110ppm within 10 to 40 mins, 330ppm within 3 minslifetime10 years from date of manufacturedimensions110 x 77 x 37mmweight203g incl. Batteries